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.
Learn how to key in an Alt-code.Hold down the Alt key and put in the numbers on the keypad to the right of the keyboard. When you finish entering the numbers and release the Alt key, the symbol will appear.earn how to key in Alt codes on a laptop. Press the Num Lock key. (If it's blue or grey, hold down the Fn key before pressing it.) The Number Lock activated the gray or blue keys on your keyboard; they should be arranged in a square. Hold down the ALT key, hit the & then the # and then use these numbers. Ad.