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There is good news and bad news regarding the number of trees on our planet. The good news that there are seven times more trees on Earth than we . Until a few years ago, scientists that the world had around 400 billion trees. However, a new study from Yale University that there around three trillion trees. That's a three by 12 zeroes. That means there more than 420 trees for every person alive today. Lead researcher Dr Thomas Crowther the BBC that the new estimate will not anything. He said: "It's not like we've a load of new trees. It's not good news for the world or bad news that we've this new number."

The bad news is that thousands of years ago, the earth around six trillion trees. Human activity has in half the number of trees on the planet. A good example of this is the fact that Europe to be one giant forest. Now much of it is farmland, fields, cities and towns. Dr Crowther people are responsible for the loss of three billion trees over the past several thousand years. Humans are around 15 billion more trees every year because of deforestation and the demand for farmland. The scientists said this figure "considerably higher" than just a century ago. Dr Crowther that: "This study how much more effort is if we are to healthy forests worldwide."