There are many reasons that large volcanic eruptions have such far - reaching effects on global climate. (scientificamerican.com)
This laid the groundwork for how atmospheric variations over time in addition carbon dioxide emissions could have profound effects on global climate. (smithsonianmag.com)
I am part of that community; we agree that human greenhouse gas emissions are having a huge, negative effect on global climate. (dotearth.blogs.nytimes.com)