Methane as a greenhouse gas[edit] Methane in the Earth's atmosphere is a strong greenhouse gas with a global warming potential of 29 over a 100-year period. This means that a methane emission will have 29 times the impact on temperature of a carbon dioxide emission of the same mass over the following 100 years.
Laptop computers. On laptop computers, the Fn key is almost always located on the bottom left-hand side of the keyboard, next to the Ctrl key. Chromebooks. Not all Chromebooks have an Fn key. For those that do have an Fn key, it is often found near the spacebar.
Tips. 1  Ensure that âNum Lockâ is on if you cannot get the degree sign to appear. Many keyboards have a light to indicate this. 2  If you are using a notebook without a separate numeric keypad, use the Fn key to activate the part of the keyboard that acts as a numeric keypad. Press and hold Fn-Alt and then type 0176.