Gllobe and Mail: CARBON SHIFT How the Twin Crises of Oil Depletion and Climate Change Will Define the Future Edited by Thomas Homer-Dixon with Nick Garrison Random House, 230 pages, $34.95 Here’s the situation, and it’s a dangerous one. In the past 150 years, the human tribe willingly became eager slaves to oil and got teenage-drunk on the fumes. But carbon is now the insidious master of our house and garden. Man-made volcanoes of CO{-2} have wrecked the climate thermostat, dried up water …