Barack Obama doesn't have a mandate for his global warming policies. He doesn't even have a mandate from his most fervent supporters.Last month, President-elect Obama promised to reduce U.S. greenhouse gas emissions to 1990 levels by 2020 — approximately a 16% cut — and then to cut them an additional 80% by 2050. That's a 68% cut from today's levels and would mean trimming U.S. carbon emissions to roughly where they were in 1905. Think about 1905 for a minute. There were just 77,988 registered vehicles in the U.S., compared to over 250 million today — or just one vehicle...