U.S. President Donald Trump said Wednesday that Washington could "conceivably" re-enter into the global Paris climate agreement.

Foreign policy experts on both sides of the aisle predicted that President Trump’s decision to take the U.S. out of the world’s most significant agreement to fight climate change would leave the U.S. isolated on the issue.

Five years after Copenhagen, we see today an unprecedented global effort to secure a successful outcome for the global climate summit to be held in Paris this December. Much progress has been made. But much more still needs to be done. It will also require a deep attitudinal change for all countries on the core, underlying question of sustainable development.

Since China and the US the two countries made climate cooperation a priority in bilateral ties two years ago, the positive gesture has stimulated international climate politics. Moves toward common stances on key issues have raised hopes for new breakthroughs at the upcoming summit in France.