simple economics
1) he can then be totally allied with the Party he has the most financial support for.
2) he makes more money as government forces subsidies for products that are not in demand, both thru direct funding like CARB's own internal carbon credit scheme, and indirectly thru products that get purchased because the buyers are getting kickbacks.
Products like silly "solar tiles" won't compete without a government paying the difference. It's easier to justify that wealth transfer by claiming it's due to "international pressure".
Way I see it, there are a number of nations who signed Kyoto and Paris but not only failed to reach their promised goals, but had no intention of ever doing so. the accord has no power or enforcement arm, and having nations signing on and sticking around who are simply giving lip service, weakens what value the whole accord held in the first place.
Pretty much, now, the Paris accord is international "greenwashing" with but a minority of excellent examples of both intent AND action.
Hell, future accords should be like an Exclusive Club. No membership unless you *already* meet the goals. Otherwise, out you go. Drop below a threshold, out you go. Want a piece of the worldwide renewables market? Better watch your emissions!