CANCUN, Mexico (Reuters) - Almost 200 nations agreed on Saturday to modest steps to combat climate change, including a new fund to help poor countries, and put off major disputes until 2011 and beyond. This is a new era of international cooperation on climate change, Mexican Foreign Minister Patricia Espinosa told delegates at the end of two weeks of talks after breaking the deadlock between rich and poor countries. The deal, reached at marathon overnight talks, comprises a plan to design a Green Climate Fund, measures to protect tropical forests and ways to share clean energy technologies and help developing nations adapt to climate change. It also reaffirms a goal of raising an annual $100 billion (63 billion) in aid for poor countries by 2020 and sets a target of limiting a rise in average world temperatures to below 2