Unraveling past climate changes that can be found in geological data, such as ice ages that repeatedly occurred over the past two million years, will help predict future global warming very reliably.
Selected Papers No.7(p.24)

The pattern of rising sea levels caused by global warming from the last ice age to the present interglacial period, will offer important indications as to rises in sea levels that are expected to occur in the near future.

For the prediction of climate change caused by global warming, there is a pressing need for the highly accurate collection of paleoceanographical data, and in particular, corals that exist on continental shelves or in areas shallower than continental shelves provide the most useful samples. It is necessary to promote seabed drilling and sampling with the use of submarines.