On the eve of the international climate summit in Copenhagen, world leaders are hopeful for a credible climate deal. A main focus has been on the divide between developed and developing nations. Entering into the summit, developed countries will likely agree to cut their emissions by 2020 and finance developing countries so that those nations can reach their goals. Those goals include curbing the growth of emissions and agreeing to short-term financing. The U.S., India, and China, the world's largest polluters, have pledged to cut down on emissions, behind countries such as Brazil, Indonesia, Mexico, Japan, and the European Union. A climate economist said the commitments come "very close" to what is needed to avoid catastrophic climate change. Obama's last-minute decision to attend the final stages of the summit makes a positive outcome more likely, as all major world leaders will be present.