crossword 1. A special type of oxigen around the Earth is called o. 2. Too much u____________ radiation is dangerous. 3. Every day we produce millions of tons of r. 4. Concentration of c___________ dioxide in the air is encreasing. 5. In most big cities, there is a lot of p. 6. Water pollution is d for health. 7, The temperature is rising and the c is changing. 8. Ozone is a type of o. 9. Global warming is also called g effect. 10.The t of the Earth is rising.