Sentences with phrase «when emissions from human activity»

Not exact matches

Global warming became big news for the first time during the hot summer of 1988 when now - retired NASA climate scientist James Hansen testified before Congress that the trend was not part of natural climate variation, but rather the result of emissions of CO2 and other greenhouse gasses from human activities.

Kessler adds, «Our results agree with this conclusion, showing that ancient methane emissions to the atmosphere in an area that is experiencing some of the greatest warming today, is actually quite small, especially when compared to more direct emissions from human activities.»

When aerosols from human activities such as industrial plant and vehicle emissions are added to the system, the energy budget has to deal with the increase.

At a time when greenhouse gas emissions from human activities are at historically high levels and glaciers are melting, Purple poses the question of human responsibility.

It is being billed as the time when nations will come together to agree on a global roadmap to reduce emissions from human activities and prevent dangerous climate change.

¶ ¶ 38 («when used -LSB-,]... fossil fuels release greenhouse gases), 39 («use of fossil fuels emits carbon dioxide»), 45 («emissions resulting from human activities are substantially increasing... greenhouse gases»), 48 («increase in atmospheric carbon dioxide caused by the combustion of fossil fuels»), 52 («fossil fuels -LSB-,]... when combusted, emit carbon dioxide»).