A solar updraft tower generates electricity with nothing more than a greenhouse and a tall chimney. A 195 meter tall prototype in Spain cheaply operated at 50 kW for years. Now there are plans to build others, including a 40 MW tower, 750 meters tall (near twice as tall as the current tallest structure in the EU). Two others, a 200 MW tower in Australia (previously discussed) or a 400 MW tower in Namibia could become the tallest structure of any kind if built: 1km and 1.5km tall, respectively. Yet even those are dwarfed by the theoretical super chimney which could stand 5km tall and 1km wide. Such a tower would use the Earth's atmosphere itself as the greenhouse, could cause rain, reduce global warming and generate over 300,000 MW of "green" electricity. [more inside]
Global warming quick fixes roundup, featuring the new water spray cooling method. There's also biochar carbon sequestration for the soil, or perhaps growing reflective crops, or growing crops with seawater in barren deserts. For the oceans, we have iron fed green algae management, and crop waste dumping too. In the skies, there's sunshading to reflect the problem rays, or perhaps a volcano simulation by filling the atmosphere with sulphur. Finally, there's an idea for a three-mile high superchimney that does it all.