When the weather is bad, homes, businesses,and lives, can be lost. Good weather can bring rain or sun to farmers when they need it. If people could control the weather then both of these things could happen. This is why the author asked if controlling the weather could be good or bad.
A plane must be lighter to take off in hot weather than on cooler days. It can even prove too dangerous for some planes to attempt a take-off. The expected warming could triple the number of days when planes face weight restrictions. If there are fewer people on the plane the price of tickets will go up.
In December the jet stream brought a lot of Arctic air to sneak all the way down to the Gulf Coast. This caused snow in most U.S. states, even in states that don't get snow like Florida. When the jet stream gets wavy, it’s easier for pockets of cold Canadian air to move to the south. Even though it seems backwards many people believe that global warming is the cause.
For the third year in a row, Earth’s thermostat broke a new record: 2016 was the warmest year since record-keeping began in 1880. July was the warmest month ever recorded. This is only the second time that the annual temperature record has been broken three years in a row according to Deke Arndt. Scientists are concerned about what will happen if this continues.