The UN chief stressed that only 10 negotiating days remain and key political issues are still on the table.
Ban told a high-level General Assembly meeting on climate change that world leaders must give clear guidance so that their ministers and negotiators take personal responsibility for the outcome of negotiations on a global deal to reduce emissions of heat-trapping gases at a landmark conference in Paris in December.
France's Foreign Minister Laurent Fabius said that "generally speaking, countries want to conclude an agreement."
Ban said "a meaningful agreement" should include a strong signal to governments and markets that the world is committed to building a low-carbon future and a green light to the private sector to invest in clean energy.
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Ban urged developed countries to provide greater clarity on how they will mobilize $100 billion per year by 2020 to support developing countries in curbing emissions, and how they will engage private finance.
Pasztor said the USD 100 billion is "of huge political importance" but if the aim is to shift the world to a low-carbon future "we're talking about trillions, not $100 billion." That's why the secretary-general is working with the private sector to shift their investments from the high-carbon to the low-carbon world which is essential for this change to happen, he said.