If the U.S. gets its way, developing countries will need to roll up their sleeves and do more to slow down global warming.

The Obama administration is taking the position that poor and rich countries alike should be legally obligated to reduce the amount of climate-changing pollution that they produce after 2020, when a new climate treaty is expected to take effect. The Kytoto Protocol approach, which saw rich countries but not poor ones compelled to rein in greenhouse gas pollution, is “clearly not rational or workable” any more, U.S. officials argue in a new submission to the U.N. Framework Convention on Climate Change.

The next big U.N. climate meeting will be held in Lima, Peru, this December, and then Paris will host a bigger one in December 2015, at which world leaders hope to finalize the new climate treaty.