Space Energy for Planet Earth
This past week saw an advance in our long journey toward energy from space. As I have argued, and depict in my Frontera series, energy from space is our only hope for long-term protection of our home planet.
The idea of beaming energy from solar collectors was just that–an idea–back in the twentieth century. But Japanese industry takes it seriously. Mitubishi just reported a significant advance in technology. They managed to transmit 10 kilowatts via microwave across 500 meters. That may not sound like much, compared to the 36,000 km distance that will be required from a geostationary satellite. But it’s an important step forward.
Why is space energy so important? Because all energy use generates waste heat–more and more of it, as more of us do more stuff. And fundamental physical laws limit the rate at which our planet can get rid of waste heat.
Even before the theoretical limits kick in, we can see how upscaling any Earth-based power supply eventually brings disaster.
Solar. Solar power works great on a local scale–every home should have a few solar panels. But scale it up to power cities? Cover the Mohave desert? Black absorptive panels replace white reflective sand. It turns out that large-scale solar may cause half as much global warming as burning carbon fuels. So the planet cooks a bit more slowly. Not a solution.
Geothermal. Geothermal works great to heat your home–even in rural Ohio. We all should go out tomorrow and install geothermal. (After my papers to grade.) But on large scale? Remember when Germany and Switzerland were putting in giant geothermal bore holes. They caused earthquakes.
Wind. Wind is a promising solution for many local areas, from New England to Antarctica. Get used to the turbines–they look as decent as telephone poles. But larger scale wind farms will actually disrupt atmospheric currents, with unknown effects on climate.
Nuclear. Yes it’s clean now, and it’s cost effective–so long as you ignore the next 10,000 years of waste site containment. If today’s ISIL bulldozed the 3,000 year-old Nimrud, what will future crazed groups do?
“Clean” coal, oil, natural gas, fracking. Anything with C in it ends up as CO2. And half of fracked gas escapes, methane, an even more potent greenhouse gas.
Energy in space is where we’ll have to go. And more–we’ll have to spend it there, too, putting all the heat-generating factories there to build our “stuff” and ship it down the gravity well. So let’s get started now.
Looking forward to seeing some of you at ICFA in Orlando.