"And in order to produce feed, you need to use land,fertilizers and agrochemicals which,in turn, affect our environment."

VOA: standard.2010.06.04

The current challenge is not only the visible soot from wood and coal fires, or smog from poorly combusted gasoline and diesel, which affects human health in direct and obvious ways, but also invisible greenhouse gases, which do not directly affect human health but will impact our environment significantly.

WHITEHOUSE: OSTP Director Holdren Keynotes Engineering Academy Summit | The White House