Sentences with «greenhouse gases from human activities»
But the second most important heat - trapping greenhouse gas from human activities, methane, already has a distinct value. (dotearth.blogs.nytimes.com)
Consequently an increase in the atmospheric concentration of greenhouse gases from human activities such as burning fossil fuels leads to an enhanced greenhouse effect. (newstatesman.com)
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. (discovermagazine.com)