The case for replacing most air travel with high speed, composite airplane like trains that fly in tubes built in freeway median strips. More than enough renewable electricity to power them can come from solar panels mounted on the tubes. This would save huge amounts of GHG from car and air travel.   more »

This really looks interesting. Most carbon offset plans, where mainly the rich and green minded like the band in this Grist article , assuage their guilt at producing all that carbon GHG disaster. By buying carbon offsets. Seem pretty phony. The money supposedly goes to renewable energy projects. Does it really?   more »