The world is not only facing an economic and financial crisis. Unless we face up to the challenge of climate change, our children will not only be forced to live in a deteriorating environment, but the very basis of our economy will be threatened by carbon-based energy sources. We desperately need "Answers to the Carbon Economy" (ACE). The ACE project seeks to find practical and economic solutions at three levels – Individual Businesses – Business to Business (B2B) relationships, and Business Parks (BP). This involves new technical solutions, and the ACE partners recognise the equal importance of the legal, financial, and operational frameworks, and even the "culture" of business relationships.