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.
Locate the number lock key on your keyboard. The number lock key is marked Num Lock or Num LK.. Depending on the brand and model of laptop and keyboard, the number lock key may be near the 10-key section or after the numbers in the number line toward the top of the keyboard.