( Edited after being fairly criticized for not contributing to the conversation )

It's problematic to say that scientists have 'proved' anything. Scientist's conclusions are always based on the available data, and at any point new data may come along that disproves their conclusion. Scientists know this of course, which is why reputable ones are never going to step forward and announce "I have proved..."

https://en.wikipedia.org/wiki/Scientific_evidence

> evidence cannot prove a theory correct because other evidence, yet to be discovered, may exist that is inconsistent with the theory