Cleaning up the air, while good for our lungs, could make global warming worse. That conclusion is underscored by a new study, which looks at the pollutants that go up smokestacks along with carbon dioxide.

Trees absorb carbon dioxide from the atmosphere to grow, so forests have long been proposed as a way to offset climate change.

But rather than just letting the forest sit there for a hundred or more years, the amount of carbon dioxide taken out of the atmosphere could be quadrupled in 100 years by harvesting regularly and using the wood in place of steel and concrete that devour fossil fuels during manufacturing, producing carbon dioxide.

There are many earth cycles. One is a cycling between warmer and colder periods which are commonly called ice ages. The causes of these cycles are complex and are related to how much sun radiation we get as well as some slight variation in the sun itself. Scientists have recently found a possible source of a huge carbon dioxide burp that happened some 18,000 years ago and which helped to end the last ice age.