The world's population has stopped, as has the polluting economic model and the transport that goes from one side to the other. Its effects have been noted in nature: animals in cities, vegetation in areas where grass was not cultivated and ^less CO2 in the air.

In particular, emissions into the atmosphere are expected to decrease this year by 2 billion tonnes of CO2, 5% compared to last year, according to a group of international experts ^published in the journal Nature Climate Change. This is the biggest drop since the 18th century, when emissions are measured, occupied before the Second World War, with a reduction of 845 million tons between 1944 and 1945.

At the most demanding point of the pandemic, CO2 emissions in Europe have fallen by up to ^27%. Almost half of the discharges (43%) are associated with transport, while industry and electricity production account for the remaining 43%. For its part, air transport has fallen by 10%.

News to take with care

It is good news for the greenhouse effect, ^{as CO2 is} the main source of emission of this effect. However, experts warn that, at the end of the crisis, gases can re-grow. This is what happened in the 2008 crisis. At this time emissions fell by 1.4%, but the following year they grew by 5.1%.

The UN Environment Programme states that to keep the temperature rise below 2°C annual emissions should be reduced by 2.7% and 7.6% if it remains below 1.5°C.