To what extent is climate change due to natural vs man-made causes?

The most common man-made causes for wildfires include debris burning or other carelessness and arson.

Across the world, however, intentional ignition can be identified as the most common man-made cause for uncontrollable fires.

Frog mutations can be triggered by natural or man-made causes.

The current concern is regarding the build-up of sediment in the lake due to both natural and man-made causes.

A town can also be abandoned when it is part of an exclusion zone due to natural or man-made causes.

Food problems are the result of both natural forces - poor rains- and man-made causes, such as conflict.

The primary man-made cause of salinization is irrigation.

I'm not trying to say there is no man-made cause of haze in the Grand Canyon.

In my view, policy must be targeted at both the natural and the man-made causes of desertification.