Associated Press: European Union leaders agreed today to stick to ambitious plans to cut greenhouse gases by 20% by 2020, but divisions over how to share the cuts were widened by fears over the impact of the financial crisis. Italy’s prime minister, Silvio Berlusconi, threatened to veto the plan unless changes were made to lessen the burden on Italian industry. “Our companies are in no state to take on costs like those we thought about last year,” Berlusconi told reporters. And the leaders of …