But this has been exacerbated by human activities which have led to: 1) an increase in greenhouse gas emissions that causes heat to remain trapped within the troposphere, and 2) a decrease in ozone in the stratosphere, causing less sunlight to be absorbed by the ozone layer, resulting in a cooling of the stratosphere.
When measuring for floor tile the rule is: Length x Width + Waste = Amount Needed. Waste Factor will vary based upon tile size, layout, configuration of room, patterns, etc. Typical waste factor is about 10%. Add 15% for tile being installed diagonally or for a room with lots of jogs and corners.
Divide the area of one tile -- in square inches -- into the total you just calculated to determine the number of tiles you need. For example, if you're tiling a 10-by-10-foot wall -- 120 by 120 inches -- and using 4-by-4-inch tiles, divide 16 square inches into 14,400 square inches to find you need 900 tiles.