By Dan Weil Activist shareholders want Berkshire to give more detail about its carbon output and to spend more on climate change. Berkshire Hathaway (BRK.B) – Get Berkshire Hathaway Inc. Class B Report is facing shareholder resolutions to do more on climate change, as its annual shareholders meeting is coming up next weekend. But Chief Executive Warren Buffett is adamantly opposed. Berkshire shareholders voted handily against climate change proposals last year. “Overwhelmingly, the people that bought Berkshire with their own money voted against those policies,” Buffett said at last year’s annu…