The debate on climate change has rapidly evolved in recent years. It is no longer on whether the evidence of human impact on climate change is real, but on whether key mitigating strategies being adopted are sufficient. For insurance industry, climate change manifests itself through a variety of risks on the asset and liability sides of the balance sheet. In our Climate Day 4.0, we are going to zoom into the following topics: How can we capture the tail dependency between heat and mortality? How can climate scenarios be navigated for ORSA purposes? How does global warming impact health insurance claims? How to construct an investment portfolio under climate constraints?