General Electric Co. CEO Jeffrey Immelt defended efforts to reduce emissions and fight climate change, after President Donald Trump reversed rules that pushed U.S. utilities to use cleaner-burning fuels.

In a blog post to employees Wednesday, Immelt highlighted the administration’s move and said climate change “should be addressed on a global basis through multi-national agreements” such as the 2015 Paris Agreement. The U.S. hasn’t withdrawn from that agreement, but the executive order has raised concern it will be hard to reach the pact’s targets.