Clearly the Earth is warming due to human activity. Anyone who denies this is just "whistling in the wind" as they say. You will not find almost anyone who has published in the area of climate change science that disagrees with this. Sure, there are a lot of crackpots linked to the fossil fuel industry that argue otherwise, but, again, those that are published, and those that specialize in this area... the vast, vast majority (something like 97%) all agree on man-made global warming.
Btw, I drive gasoline powered vehicles, and use a gas powered lawnmower. I'm not against the use of fossil fuels, but I am a rational pragmatist.... human activity is leading to more and more global warming. We don't have to stop using fossil fuels, but we most certainly should do more to diversify our energy usage and attempt to employ more "carbon neutral" and less polluting means of energy production.