With reference to Radioactive pollution, consider the following statements:

1. Radioactive pollution is caused only due to anthropological activities and thus is observed only on Earth.

2. A radioactive pollutant with a longer half-life will have a greater impact on human health than the one with a shorter half-life.

3. Cobalt, Calcium, and Iodine have radioactive isotopes that cause radioactive pollution and environmental degradation.

Which of the statements given above is/are correct?