A new report says there are three trillion trees on Earth, eight times more than the previous best guess.
Newsround viewer Shonny is making the big move from primary to secondary school. She tells us how her first day was in emojis.
Thousands of people are travelling to Europe every day in the hope of a better life. But many European governments are struggling to cope with the huge numbers of new arrivals.
Martin has Thursday's top stories
A skyscraper in London, nicknamed the Walkie Talkie, wins the Carbuncle Cup for the UK's worst new building.
A special £20 coin is being made to commemorate the Queen becoming Britain's longest reigning monarch.
China held a large military parade to mark 70 years since their defeat of Japan and the end of World War Two.
It's being called the world's first kids only cafe. Ricky went to meet the team behind the one-off restaurant in north-east Wales to find out more.
After decades of controversy, the name of Mount McKinley, the tallest mountain in North America, is changed back to its original native Alaskan name, Denali.
A new ingredient developed by scientists in Scotland could mean that ice cream fans can enjoy their treats before they melt.