I'll fix it for you... climate has always changed. 
Granted without qualification. The current warming trend has been going on for 25,000 years, yet we are led to believe that humankind's influence has drastically sped it up in the last 150 years or so. Greens have blamed it on everything from cow farts to carbon emissions.
Fifth grade science says that all green plants need water, carbon dioxide, and sunlight to survive. What are the major greenhouse gases as identified by the greens? Carbon dioxide, methane, and water vapor.
The truth is, in a sealed environment, those three gases won't change and will remain more or less constant in volume. However, with the introduction of the free radical, a single oxygen atom, commonly known as ozone, the whole system changes.
With the addition of ozone (O1), methane (HC4) resolves into carbon dioxide (CO2) and water (H20). Additionally, those catalytic converters, that hyped the greens up so much 35 years ago, convert unused unleaded gasoline into... wait for it... carbon dioxide and water.
The reasoning behind the catalytic converters is that a) they have to have unleaded gas, so they prevent the release of more lead into the atmosphere, and b) carbon dioxide and water is much better for life all around than carbon monoxide and lead and whatever else. Even so, internal combustion engines that release carbon monoxide aren't as poisonous as you might think, because, in an atmosphere that contains ozone, carbon monoxide will convert into carbon dioxide.
And where do we get ozone? Lightening strikes produce ozone as well as active volcanoes. But, interestingly enough, electrical systems, transformers, generators, alternators, and high voltage wires create ozone from the surrounding air. Even a low voltage electric fence, such as the one I have around my pasture, produces ozone.
As a side note, animals can smell ozone, and that's how they know whether or not an electric fence is working. If you ever had a model railroad set as a kid, the aroma produced by the AC transformer comes from the ozone it produced.
And now, since I've given plenty of points from my detractors to find fault with everything but the punctuation, I'll stop.
