If you want to help the environment, you regulate both gas usage and exports. The goal is to keep gas in the ground, where it belongs, not to move it to other countries.
Except gas exports are largely being used to retire brown coal burning which is even worse for the environment than LNG. This isn't an all-or-nothing deal even with exports. The richer countries should take on the costs of better efficiency first and we can trickle those technologies down to other nations as they become cheaper than LNG and coal.
