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.
If you hit the letter key on the keyboard, but the system show number, that 's because fn key locked, try the solutions bellow to unlock function key. Solutions: 1  Hit FN, F12 and Number Lock key at the same time. 2  Hold down Fn key and tap F11.. 1  Turn on the computer. 2  Press the F10 key to enter the BIOS setup window. 3  Use the arrow keys to navigate to the System Configuration option. 4  Enter the Action Keys Mode option, and then press the enter key to display the Enable / Disable menu. 5  Select Disabled, press f10 key to save the selection and reboot.