That's 110 pounds per square meter of the Earth's surface
                                
                                
                                    (Newser) -
                                    Humans have built a ton of things to keep us alive on this twirling little rock: farms, airports, roads, CDs, houses, computers, landfills, and so forth. All these things are known as the technosphere, and for the first time ever—in a study published last month in the  Anthropocene Review...