Reuters: Denmark’s prime minister called on rich and poor countries alike to commit to big cuts in greenhouse gas emissions, ahead of key year-end talks on a new climate treaty he will host in Copenhagen. Hopes that a deal may be possible have increased since the election of what many see as a “green” U.S. president and business is increasingly enthusiastic about the opportunities thrown up by climate change. “It is essential to engage heads of state and government stronger in the whole …