Mapped Arctic sea ice extent (SIE) on this date was 13.12 million km2 which is 430,000 km2 or 3% less than the 2008-2018 median. This is largest sea ice extent on this day since 2014 and the 12th highest since 2000. We predict maximum SIE of 15 million km2 to be reached in early April 2020.
The extent of Arctic sea ice varies from summer to winter. The sea ice extent shown here relies on data from the Multisensor Snow and Ice Mapping System (IMS) that runs at the National Ice Center. The IMS product uses several satellite data sources including passive microwave, but it is also based on visual analysis and other data sources and undergoes a form of manual data fusion. The data reported here has a 1 km resolution and was sourced from the National Snow and Ice Data Center
Mapped Arctic sea ice extent (SIE) on this date was 13.176 million km2 which is 280,000 km2 or 2% less than the 2008-2018 median. This is largest sea ice extent since 2012 and the 12th highest since 2000. Sea ice is steading growing in the Bearing and Barents Seas and around Greenland. We predict maximum SIE of 15 million km2 to be reached in early April 2020.
The extent of Arctic sea ice varies from summer to winter. The sea ice extent shown here relies on data from the Multisensor Snow and Ice Mapping System (IMS) that runs at the National Ice Center. The IMS product uses several satellite data sources including passive microwave, but it is also based on visual analysis and other data sources and undergoes a form of manual data fusion. The data reported here hasa 1 km resolution and was sourced from the National Snow and Ice Data Center
Marine Regions releases version 11 of the Maritime Boundaries
It’s out! Marine Regions newest version of the Maritime Boundaries is now ready for download. Version 11 includes United Nations standard country codes and is updated with new treaties. This GIS data includes territorial limits and Exclusive Economic Boundaries. Essential data if you have an offshore interest.
The United Nations Standard Codes (or M49 codes) and ISO country codes per territory and sovereign have been included in the attribute tables of the Exclusive Economic Zones, the 12 & 24 Nautical Miles zones, the Internal and the Archipelagic Waters.
Now Maritime Boundaries are centered in the Pacific Ocean. These new 0 to 360° products make your life easier when you need to work in regions where the longitude is near 180°.
With Global Warming protests and strikes held by student in a number of countries, a group of 500 scientists and other “professionals in climate and related fields” have written an open letter to the United Nations . In the letter, the signatories state that “climate science should be less political, while climate policies should be more scientific,” while also denouncing “the uncertainties and exaggerations in…predictions of global warming.” The text is reproduced below and the full letter available for download.
There is no climate
A global network of 500
scientists and professionals has prepared this urgent message. Climate science
should be less political, while climate policies should be more scientific.
Scientists should openly address the uncertainties and exaggerations in their
predictions of global warming, while politicians should dispassionately count
the real benefits as well as the imagined costs of adaptation to global
warming, and the real costs as well as the imagined benefits of mitigation.
Natural as well as anthropogenic factors cause
The geological archive reveals that Earth’s
climate has varied as long as the planet has existed, with natural cold and
warm phases. The Little Ice Age ended as recently as 1850. Therefore, it is no
surprise that we now are experiencing a period of warming.
Warming is far slower than predicted
The world has warmed at less than half the
originally-predicted rate, and at less than half the rate to be expected on the
basis of net anthropogenic forcing and radiative imbalance. It tells us that we
are far from understanding climate change.
Climate policy relies on inadequate models
Climate models have many shortcomings and are
not remotely plausible as policy tools. Moreover, they most likely exaggerate
the effect of greenhouse gases such as CO2. In addition,
they ignore the fact that enriching the atmosphere with CO2 is
plant food, the basis of all life on Earth
is not a pollutant. It
is essential to all life on Earth. Photosynthesis is a blessing. More CO2 is
beneficial for nature, greening the Earth: additional CO2 in
the air has promoted growth in global plant biomass. It is also good for
agriculture, increasing the yields of crops worldwide.
Global warming has not increased natural
There is no statistical evidence that global
warming is intensifying hurricanes, floods, droughts and suchlike natural
disasters, or making them more frequent. However, CO2-mitigation
measures are as damaging as they are costly. For instance, wind turbines kill
birds and bats, and palm-oil plantations destroy the biodiversity of the
Climate policy must respect scientific and
There is no climate emergency. Therefore, there
is no cause for panic and alarm. We strongly oppose the harmful and unrealistic
net-zero CO2 policy proposed for 2050. If better approaches
emerge, we will have ample time to reflect and adapt. The aim of international
policy should be to provide reliable and affordable energy at all times, and
throughout the world.
Jonathan Carroll-Nellenback and partners have published a fine article in Astrophysical Journal on a modelling exercise on civilizational expansion across the Milky Way, addressing the Fermi Paradox. According to a study published last month in The Astronomical Journal, extraterrestrial life might be taking its time to fully explore the galaxy, even using the movement of star systems to make this type of journey easier.
The Fermi Paradox has a long history in discussions of the prevalence of “alien” technological civilizations (i.e. ‘exo-civilizations’) in the galaxy. Originating with a lunchtime conversation in 1950 where Enrico Fermi famously asked ‘where is everybody?’, the Fermi paradox was first formalized in 1975 and has since become a standard framework for addressing questions concerning the prevalence of exo-civilizations. Formally the paradox might be expressed as follows: “If technologically advanced exo- civilizations are common, then we should already have evidence of their existence either through direct or indirect means”
Assuming amongst other things that any interstellar probe would have a minimum velocity of 30km/sec which would be achievable using gravity assist from large planets within 1 AU they reach a number of interesting conclusion:
When diffusive stellar motions are accounted for, they contribute to the Galaxy becoming fully settled in a time less than, or at very least comparable to its present age, even for slow or infrequent interstellar probes;
If a settlement front forms, all settleable systems behind it become “filled in” in a time less than the current age of the Galaxy;
While settlement wave crossing and fill-in times are short, consideration of finite civilization lifetimes in a steady state model allows for conditions in which the settled fraction is less than 1. Thus the galaxy may be in a steady state in which not every settleable system is currently settled.
Statistical fluctuations in local density of settleable systems allows for the formation of settlement clusters which can continually resettle one another. These clusters are then surrounded by large unsettled regions. If such conditions represent the situation in our region of the galaxy and Earth was not in one of the ”re-settlement” clusters it would be highly probable that we would not have been settled (or visited) by another civilization for some time.
By consideration of the convolution of steady state solutions with geologic evidence horizons, it is possible to find situations in which Earth may not have experienced a settlement event for longer than some horizon time (assumed to be 1 Myr) even though the galaxy supports a population of interstellar civilizations.
Even for slow probes (30 km/sec) they find that the upper limit of the galactic crossing times are just less than 1 Gyr. This is in accord with our modelling for the colonization of the Type A stars within 100 LY of Earth assuming 5 habitable planets amongst the 75 stars that meet this criteria. We estimated that dependent on probe speed would take between 350,000 and 900,000 years.
The authors discuss amongst other things the energy requirements for interstellar travel and suggest that this is a major impediment to the postulated wave of colonization. A multi-generational ship would they suggest require economies equivalent to that of entire solar systems. They consider a ‘medium multi-generational cruiser’ case . This would be a ship traveling at v = 0.05c, carrying a population of 104 people and weighing 107 tonnes. Such a ship would require a power of 6900 zettajoules (ZJ) funded by a solar system wide civilization of 900 billion people that would generate 1136 ZJ per year. The world presently produces around 1 ZJ Joule and this quantum of energy would require a significant civilizational commitment.
We model the settlement of the galaxy by space-faring civilizations in order to address issues related to the Fermi Paradox. We explore the problem in a way that avoids assumptions about the intent and motivation of any exo-civilization seeking to settle other planetary systems. We first consider the speed of an advancing settlement via probes of finite velocity and range to determine if the galaxy can become inhabited with space-faring civilizations on timescales shorter than its age. We also include the effect of stellar motions on the long term behavior of the settlement front which adds a diffusive component to its advance. The results of these models demonstrate that the Milky Way can be readily ‘filled-in’ with settled stellar systems under conservative assumptions about interstellar spacecraft velocities and launch rates. We then consider the question of the galactic steady-state achieved in terms of the fraction of settled planets. We do this by considering the effect of finite settlement civilization lifetimes on the steady states. We find a range of parameters for which the galaxy supports a population of interstellar space-faring civilizations even though some settleable systems are uninhabited. Both results point to ways in which Earth might remain unvisited in the midst of an inhabited galaxy. Finally we consider how our results can be combined with the finite horizon for evidence of previous settlements in Earth’s geologic record. Our steady-state model can constrain the probabilities for an Earth visit by a settling civilization before a given time horizon. These results break the link between Hart’s famous “Fact A” (no interstellar visitors on Earth now) and the conclusion that humans must, therefore, be the only technological civilization in the galaxy.
I have had occasional issues with the import of Arc/Info Binary Grid format files into ARCGIS. The solution is all too easy. The import script is legacy and relies on the oldest of ARCGIS file and directory formatting requirements, no spaces. No spaces in parent directories or file names. The naming convention in ARCGIS is really quite annoying at times.
Chief Engineer at the country’s Federal Power Ministry, Ghanshyam Prasad, said coal capacity is likely to reach 238GW by 2022
India expects coal-fired power capacity to grow by 22% in three years. That’s according to the Chief Engineer at the country’s Federal Power Ministry, Ghanshyam Prasad, who Reuters reported as stating coal capacity is likely to reach 238GW by 2022.
India’s Coal Minister, Pralhad Joshi previously said annual coal demand rose by 9.1% during the year ending March 2019, noting the figure hit 991.35 million tonnes, driven primarily by utilities, which accounted for three-quarters of total demand.
India’s electricity demand rose by 36% in the seven years up to April 2019, while coal-fired generation capacity during the period rose by three-quarters to 194.44GW.
The vast expenditure on renewables during the past decade has seen installed capacity equivalent to a mere 2% of global energy demand. The world remains and will remain dependent on fossil fuels well into the 21st century if not beyond.
A new report by Woods MAckenzie forecasts that coal, oil and gas will still contribute about 85 per cent of primary energy supply by 2040, compared with 90 per cent today, jeopardising efforts to contain the worst impacts of climate change.
Energy consultancy Wood Mackenzie said 1 TW of installed solar and wind capacity makes up around 8 per cent of total power generation as of 2019. This equates to just a fraction of total energy consumption.
The deamnd for energy is not coming from teh developed western economies, it is the emergining economic playing catch-up in Asia and Africa that will see an increase in energy deamnd of 25% though 2040.
If the World was to aggressively pursue compliance with the PAris accord and the Green New Deal, developing countries would be forever remain in energy deficit and the wealth transfer that is renewable subsidies would continue to enrich the top 1%.
Renewables have a role to play where they can be supported by economics, particularly in remote areas lacking energy infrastructure, but for much of the world, fossil fuels will remain the energy source of choice for at least the next 50 years.