How to decorate your Christmas tree There’s now a handy tool to help you figure out exactly how many lights and ornaments you need for your ideal tree.

For Sophie’s tree that means 110cm 3.14 = 35cm diameter. To calculate the TPZ, multiply the diameter by 12; for Sophie’s tree that is 35 x 12 = 420cm or 4.2m.

From that, scientists can directly calculate how much carbon has been absorbed. To measure tree height around the globe, Lefsky used lidar data from a satellite orbiting 600 kilometers above Earth.

Find a tall stick. That and one good eye are all the tools you’ll need. With the stick in hand, walk exactly 11 paces from the base of the tree and mark the spot by driving the stick into the ...