Building a dome over every city on earth may reduce or eliminate global warming. If you accept the theory of global warming, you accept the idea that human industrial activities (mostly heat emitted by cities and towns) are gradually causing the earth to become warmer. If that's true, then one possible solution to global warming would involve building a dome to cover every city and town on earth. If a city was covered with a dome, all the heat produced by factories in that city would be trapped inside the dome. As long as the heat was trapped in the dome, the heat will never escape into the Earth's atmosphere, and therefore, the heat would never contribute to global warming.
One way to start building domes is to build a dome over every power plant on earth. This would include all types of power plants, including nuclear and fossil-fueled plants. After a dome is built over a power plant, all the heat produced by that plant remains trapped inside the dome, and therefore the heat will never contribute to global warming since the heat will never escape into the Earth's atmosphere. After all the power plants on earth are covered with domes,then you would start on the factories. Any factory that produces a significant amount of heat would have to be covered with a dome. After all the power plants and factories in the world are covered with domes, you would start on cities and towns.
First, you would build domes large enough to cover small towns. After a town has been covered with a dome, the heat produced by cars and trucks in that town will not contribute to global warming, since the heat would remain trapped inside the dome. The cars and trucks inside the dome cannot be fueled by gasoline, because of the toxic fumes given off when it burns, so all the vehicles in the domed towns must be electrically-powered vehicles, or they must be powered by hydrogen fuel cells, or powered by internal combustion engines fueled with a non-polluting fuel such as hydrogen. After domes have been built over all the small towns on earth, you would build domes over the larger towns, and finally, domes would be built over cities. If a city was too large to cover with a single dome, the city would have to be divided into neighborhoods, and each neighborhood would be covered with a dome.
Tunnels would be built underground to connect domed cities and towns together. The tunnels are an important part of the domed-city infrastructure because the cars and trucks that travel through the tunnels produce heat. The heat produced by these vehicles cannot be allowed to escape into the Earth's atmosphere, because if it did, it would contribute to global warming. As long as all the vehicles stay in the tunnels they will not contribute to global warming, since the heat they produce will remain trapped inside the tunnels, where it can never escape into the Earth's atmosphere. It would have to be illegal for vehicles to travel on the surface, unless they can operate without producing heat. Any heat-producing vehicles must be operated in tunnels.
Building domes over all the cities on earth would also protect people from storms. The global warming theory says that global warming would increase the number of dangerous storms, including hurricanes, cyclones, and tornadoes. Houses and buildings located outside domes would be vulnerable to storm damage, but structures located inside the domes would be protected from storms. Living in a domed city wold also protect you from disease. Tropical diseases like malaria were once confined to regions near the equator, but global warming will cause tropical diseases to spread as far north as Canada and Alaska. If you lived in a domed city, the air you breathe would be free from germs. All the air entering the dome would be filtered to protect the health of the residents. The dome would also keep out birds and insects that carry diseases.