what was the main similarities and difference between the environmental policies of George w. bush and barack Obama

Obama changed Bush's environmental policies and created a new one with the aim of attending a complicated environmental crisis that the country and the world were suffering.

In that order, the following are the differences and the similarities between George Bush and Barack Obama's environmental policies.

Similarity:

Both, Bush and Obama wanted to do something about the pollution that the carbon power plants were causing to the environment. Bush proposed a campaign in order to regulate and reduce the air pollution produced by these power plants and Obama presented the program Clean Power Plan with the same goal than Bush, to reduce carbon pollution from power plans and mitigate climate change.

Difference:

While Obama worked to protect the earth by protecting over 550 million acres of federal land, Bush developed and also protected 3 million acres of wetlands by making water quality better.