Every year the US burns more than 34 million tons of garbage in incinerators. These plants are major pollution sources, and most are clustered in disadvantaged communities.
Both natural and artificial Christmas trees have environmental impacts, but they're not major. What matters most is what happens to the trees after the holidays.
Research shows that when Americans are aware of the scale of food waste, and how much energy and water are used to produce food, they support measures to reduce the problem.
Plenty of cafes these days will let you take home some used coffee grounds, to put on your garden. It's a versatile material with loads of potential uses - as long as you treat it properly first.
New research shows most people try to shop and cook carefully – the real problem with food waste is infrastructure.