Wildfires don't really play into climate change much, carbon gets released, the plants grow back. In the same way, planting trees doesn't help climate change much, its just a temporary buffer.

Also it is easy to say "build water projects", but to actually do it is not so simple. Build what exactly, where, and what other consequences will result? The world is crowded enough that people's usual "simple" solutions almost always cause other problems, or are vastly too small in scale to help anything at all (plant trees! don't use paper straws!)