As physicist Michio Kaku wrote yesterday, “Global warming is controversial, of course, but the controversy is mainly over whether human activity is driving it. There is almost uniform agreement from both sides of the debate that the Earth is heating up.”
More specifically, the controversy centres around whether the rise in global CO2 levels is a direct result of mans’ activities or whether this is something the planet itself is responsible for. This is seen (somewhat linearly) as the engine behind the rise in temperatures. So can both sides be right if one says global warming is caused by human activity and the other says it isn’t?
They can if the rise in temperatures and CO2 levels is the Earth’s response to mankind’s activities.