People are getting cancer more often because they are less likely to die of the diseases that were more common in other eras. Age is one of the largest factors in whether someone will get cancer. Lifestyle has a far larger effect. Drinking to excess, smoking and eating fatty foods are far more likely to give you cancer.
Cancer is caused by changes or damage to cell dna that results in rapid reproduction of non functional cells. as technology advances and humans continue to create new compounds, many more substances are released into the environment that people cannot avoid. If only a fraction of substances are carcinogenic, increase cancer risk, and we realease new substances, the risk of cancer increases. The EPA and other agencies continue to investigate and regulate substance releases into the environment. With proper funding, we can begin to reduce our exposure and risk.
We must take strong action to conserve nature, environment and human health. If you think about the mechanism and physiology of cancer, you could end up with a conclusion: almost all cancers are caused by environmental factors (including not only air pollutants but all those pollutants we eat or put on our skin). Of course not counting the few ones that are clearly caused by viruses...
Yes, environmental cancers are on the rise due to issues such as global warming and pollution. The ozone layer has become thinner, which allows more UV rays to reach the planet. Excessive exposure to UV rays causes skin cancer. The decrease in the ozone layer is caused by pollutants in the atmosphere, such as carbon dioxide and chlorofluorocarbon. These become trapped between the Earth's surface and eat away at the ozone layer, resulting in global warming which helps to continue the cycle.