system
Given the following post, respond as if you're commenting on Reddit:
human
Why don't plants get sunburned or genetic damage/cancer being out in the sun all day?

When UV-B radiation and other solar radiation hits plants like trees or grass, why does it not cause genetic damage to the plants DNA?
gpt
It does and they do. Though as others here noted, many things help them defend against it.

Leaves are disposable though, and the outer layers of bark are usually dead plant material that protects the rest. 

Most crucially, most plants don't have cells circulating like animals do, so they can't really get anything like metastatic cancer. They also lack vital organs that can become diseased and kill the whole plant.

Plants get tumours of sorts for all kinds of reasons but they can't generally spread and kill the whole organism.