system
Given the following post, respond as if you're commenting on Reddit:
human
Has nuclear testing during the 20th century contributed to climate change, and if so, to what extent?
gpt
For a short while; it’s proposed that it would have cooled our climate off slightly from suspended particulate matter scattering insolation. An interesting fact though, radioactive dust deposited fairly uniformly around the world, so we can still see this layer in ice sheets which helps narrow the window for dating “older ice”.