Re "Kerry: Climate change poses fearsome threat" (Page A9, Feb. 17): Secretary of State John Kerry derided climate-change skeptics. According to a very basic natural law, our atmosphere is constantly changing. If it weren't for climate change, a gigantic glacier would still fill the entirety of Yosemite Valley. Similarly, Canada would still be covered with huge glaciers and the Great Lakes, the remnants of the ancient glaciers, would not exist.
To think that humans have expedited, let alone caused, any significant change in our atmosphere is naive at best.
-- Roland John Bain, Sacramento