COPENHAGEN, After two years of preparation and anticipation, the U.N. Climate Change Conference, or COP15, opened Monday amid growing hope an agreement between developed and developing countries on specific greenhouse gas targets is within reach.

Attention began to turn toward who will pay for developing countries to reach their announced emissions goals, and how much it will all cost.

"As I speak to you this morning, 110 heads of state and government have announced they will be coming to Copenhagen next week to participate in the concluding days of this conference. It represents a huge opportunity the world cannot afford to miss. But the political will to forge a global agreement is manifest," Danish Prime Minister Lars Rasmussen said in his welcome address.