Around the world this year, often record-breaking droughts have brought to the surface (quite literally) many archaeological sites and artefacts that were previously submerged. For a snapshot of the kinds of work archaeologist can undertake in these conditions, see this article in South China Morning Post:
https://www.scmp.com/news/people-culture/article/3191741/how-archaeologists-handle-once-submerged-ruins-revealed-during
While this is one example of how climate change affects archaeological sites, at the same time, many areas experience increased flooding that can jeopardize sites thought to be relatively safe. There is also increased coastal erosion, often necessitating collaborative research of archaeologists and communities impacted by climate change to protect sacred and other important cultural sites.