At no point in the period of Earth's history examined, the study notes, have temperatures warmed as quickly as they're warming now. Global warming ... heat-trapping greenhouse gases, like carbon ...

Ongoing temperature recordings using thermometers have shown a clear warming ... and the level of greenhouse gas emissions. If greenhouse gas emissions continue then average global temperatures ...

Agriculture produces a substantial amount of greenhouse gas emissions, which contribute greatly to global warming and climate change. Stable and radioisotopes can be used to develop technology ...