Some speed dating diplomacy at the United Nations this week.

Secretary-General Ban Ki-Moon will host a special session on climate change and the topics of Islamic State, Ukraine and tensions between Israel and Gaza are all on the agenda.

For secretary-general Ban Ki Moon, climate is issue number one.

But CNN's Richard Roth says there won't be any treaties signed here.

"The goal is to try and get up a new momentum to get the first ever legally binding international treaty regarding climate change in Paris."

Richard Roth says the White House wants to revive climate as a top political issue - but crucially, the leaders of India and China will miss the special one day special session on it tomorrow.