Humans are throwing Earth’s energy budget off balance
Earth is on a budget – an energy budget. Our planet is constantly trying to balance the flow of energy in and out of Earth’s system. But human activities are throwing that off balance, causing our planet to warm in response.
Radiative energy enters Earth’s system from the sunlight that shines on our planet. Some of this energy reflects off of Earth’s surface or atmosphere back into space. The rest gets absorbed, heats the planet, and is then emitted as thermal radiative energy the same way that black asphalt gets hot and radiates heat on a sunny day.
Eventually this energy also heads toward space, but some of it gets re-absorbed by clouds and greenhouse gases in the atmosphere. The absorbed energy may also be emitted back toward Earth, where it will warm the surface even more.
Adding more components that absorb radiation – like greenhouse gases – or removing those that reflect it – like aerosols – throws off Earth’s energy balance, and causes more energy to be absorbed by Earth instead of escaping into space. This is called a radiative forcing, and it’s the dominant way human activities are affecting the climate.
Climate modelling predicts that human activities are causing the release of greenhouse gases and aerosols that are affecting Earth’s energy budget. Now, a NASA study has confirmed these predictions with direct observations for the first time: radiative forcings are increasing due to human actions, affecting the planet’s energy balance and ultimately causing climate change. The paper was published online on 25 March 2021, in the journal Geophysical Research Letters.
Russian Arctic coast has planet’s quickest warming
It was the second warmest year in the Arctic on record, and parts of the vast region saw air temperatures far beyond the traditional freeze. The year 2020 follows the trend of the past decades and its spring months were the absolutely warmest since measurements started more than 100 years ago, a weather report from Russian meteorological service Roshydromet reads.
Parts of the Russian Arctic are now several degrees warmer than just few years ago. The warming is the most significant along parts of the North Siberian coast, and especially around the peninsulas of Taymyr and Yamal. Heat maps show that an area on the coast of Taymyr in 2020 had average temperatures up to 7’C higher than normal.