wow i guess he did say ONE of the claims.
looks like his reputation may be overstated.
he used bullshit numbers and flawed assumptions to develop his assertion of 500 megatonnes per anum.
http://carbon-budget.geologist-1011.net/
the bullshit is expanding geometrically.
http://www.nytimes.com/1997/12/26/us/yellowstone-park-emits-tons-of-carbon-dioxide-study-finds.html
ohh look yellowstone park's Mud Volcano emits 176,000 short tons of co2 per year, EVERY year for... THOUSANDS of years. and thats JUST A SMALL PART of the yellowstone caldera system
theres over 3000 active surface volcanoes on the earth, and nobody knows how many under the sea, and nobody knows how much co2 comes from the tectonic expansion joints.
he took an assumption, turned it into a strawman, and beat the shit out of it. but it was for the popular press, not a journal so i guess he felt the need to get in a few cheap shots.
thats not all hyroot claimed though...
but where does he say "man made machines are making 90% of the co2 emitted every year"?
where does he state that "all the forests were cut down"?
the mystery deepens