Scientists say increased carbon dioxide (CO2) in Earth’s atmosphere is causing global temperatures to warm – sea levels to rise – and storms, droughts, floods and fires to become more severe. Here are 6 things about CO2 you might not know.
For the northern part of Earth, the season for seeing noctilucent clouds – clouds that shine at night – typically begins in June. This June has been particularly fine for seeing these electric-blue clouds. Photos and video here.