Green this, green that. Have our biggest corporations seen the light? Green marketing guru Joel Makower thinks their conversion may actually be for real.
Even sober energy experts wonder if Alberta has gone mad as the province tears up a vast wilderness to get at the world's dirtiest, most expensive -- and perhaps last -- reserves of oil.
So far, rational environmental arguments have largely kept Utah's tar sands, which contain an estimated 12 billion to 20 billion barrels of oil, in the ground. Rising oil prices, however, may soon erase these historic constraints, just as they have done in Canada.