 A Scandinavian country is scoring an environmental first. CBS's Vicki Barker explains. In order to become climate neutral by the year 2045, Denmark is doing this. Taxing farmers for the greenhouse gases emitted by their cows, sheep, and pigs. The tax will take effect in 2030, the year Denmark is supposed to reduce its greenhouse gas emissions by 70%. It's the first country in the world to tax this major source of methane, which is one of the most potent gases contributing...