I agree that little has transformed the earth more than agriculture, but it is inaccurate to say that “30 percent of greenhouse gases come from agriculture.” The reason that this is inaccurate is because what really counts (though it is not the only thing that counts) is the release of carbon that was previously trapped in fossil form. Such of the “green house gas” mentioned in the video does not involve fossil carbon.
Anyway, having said that, here is a blog post that is linked to the video you just watched:
The Other Inconvenient Truth
It’s taken a long time, but the issue of global climate change is finally getting the attention it deserves. There is now widespread acceptance of the need to confront energy security and global warming. We finally acknowledge that our addiction to fossil fuels, which has been harming our national security, economy and environment for decades, must end.
Unfortunately, this positive shift in the national zeitgeist has had an unintended downside. Climate change has become the poster child of environmental crisis, complete with its own celebrities and campaigners. But is it so serious that we can afford to ignore equally serious environmental issues, such as the rise of infectious disease, the collapse of fisheries, the ongoing loss of forests and biodiversity, and the depletion of global water supplies?