Reuters: Countries such as the United States can come up with ideas for a U.N. climate pact beyond an April 24 deadline, the U.N. Climate Change Secretariat said on Friday. Among a few submissions this week, African nations said developing nations will need to get at least $267 billion a year by 2020 to help them fight climate change under a treaty due to be agreed in Copenhagen in December. Many other nations have laid out their views of the content of the deal to succeed the Kyoto …