Between 2005 and 2017 the U.S. economy as measured by real GDP expanded by about 20 %. Over this same period, emissions from power generation dropped which is evidence of a decoupling between economic growth and power generation.
In 1997 Raymo was the first to provide observations supporting the orbital forcing hypothesis for glacial/deglacial cycles that did not rely on orbital tuning. The research also suggested that ice sheet dynamics needed to be considered in addition to orbital forcing to explain the observed 100,000 year glacial/deglacial cycles.
A seminal book by Milankovitch in 1941 proposed that the sequence of ice ages that has characterized long term changes in the Earth’s climate over the past hundreds of thousands of years was due to changes in the amount of solar radiation reaching the Earth as a result of small variations in the Earth’s orientation and orbit with respect to the sun. Since then research has shown that Milankovitch cycles by themselves do not determine the timing of glacial and interglacial cycles and that we still lack a unified mechanism that links changes in Earth’s orbit to ice ages.
A recent study presents evidence that regional warming over the Arctic Ocean can affect mid-latitude Northern Hemisphere continental weather. This study shows that there are two key Arctic regions where regional warming can induce distinguishable cold winters over northern continents. Warming over the Barents–Kara Sea region is likely to lead to East Asian cooling, whereas northern North America cooling is closely related to warming over the East Siberian–Chukchi Sea region.