The top page banner has been updated. We're releasing it with a Creative Commons "share alike" license. Sources for components of the merged image are as follows:
Oil derrick - BBC news
Smokestack - US NARA/EPA via nasa.gov
Traffic jam - US EPA
Nuclear reactor - US LANL (Dept. of Energy)
Powerline - from BeigeJournal by Michael Pereckas
Grand Coulee dam - from usbr.gov
Wind farm - from eere.energy.gov (Dept. of Energy)
Solar panel - NREL/Astropower via climatetechnology.gov
Switchgrass - US Dept. of Agriculture via climatetechnology.gov
Solar Power Satellite construction - Space Studies Institute.