The document summarizes several ecological problems in Saint Petersburg, including various forms of pollution, noise from vehicles, and destruction of green spaces. Water pollution is caused by industrial waste, domestic waste, detergents, and drainage. Air pollution results from factory emissions and vehicle exhaust. Noise pollution comes primarily from cars and buses. Deforestation has reduced green spaces and increased carbon dioxide levels, contributing to global warming. Proposed solutions include moving factories out of the city, protecting green spaces, reducing waste and noise, and using alternatives to vehicles like walking or bicycling.