Gillis looks at the warning signs from the world's forests and the signals aren't good: wildfires, drought and insect infestations are
putting vast tracts of forests under extreme stress, leading to feedback loops that result in more CO2 in the atmosphere.
During the last century, the Australian government encouraged farming on difficult land, handing out water licenses to just about anyone willing to
put in the backbreaking toil of making the country's
vast tracts of scrub desert bloom with citrus orchards and vineyards.