My Republican friends who think climate change is not being caused by human activities (“Bad data underlie global warming claim,” Jan. 21) should consider why major metropolitan areas have spare-the-air days. It’s because such results of human activity as vehicle emissions, power-plant emissions, and agricultural emissions foul the air to the point it is harmful to our health.
Tens of thousands of people die every year because of cancers and respiratory ailments caused by air pollutants. Burning anything—cigarettes, wood, coal, peat, oil, or gas—produces harmful toxins. If we don’t clean up our planet, we could join the extinct species.
-- Ken Highfill - Cayucos