A man uses a bicycle-powered battery charging station at the United Nations climate summit in Le Bourget, France on Dec. 4, 2015.
A man uses a bicycle-powered battery charging station at the United Nations climate summit in Le Bourget, France on Dec. 4, 2015. dsiders@sacbee.com The Sacramento Bee/David Siders
A man uses a bicycle-powered battery charging station at the United Nations climate summit in Le Bourget, France on Dec. 4, 2015. dsiders@sacbee.com The Sacramento Bee/David Siders