If you can’t find a Christmas tree this year, look at Canada. It usually exports millions of trees to the US. But this year, Canadians are keeping most of those trees for themselves. One culprit? Climate change. Record droughts and floods have hurt Canada’s tree farms, and many tree farmers have left the business entirely. Reporter Anita Elash examines what’s behind this year’s shortage of Canadian Christmas trees.Correction: This story incorrectly identified Andrea Stader’s partner. His name is Gareth Smith. We regret the error.