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.
A 12-by-12-inch tile will cover one square foot, but four 6-by-6-inch tiles will cover one square foot. Once you know how many tiles you need per square foot, multiply that number by the number of square feet you need, as determined in Step One. For example, If your area to be tiled is 50 square feet, you will need 50 12-by-12-inch tiles, but you will need 200 6-by-6-inch tiles to cover the same area.