Heat waves, for starters. In 2003, a heat wave in Europe had a death toll over 70000. In 2010, more than 50000 people died in Russia during a heat wave. Those w

Heat waves, for starters. In 2003, a heat wave in Europe had a death toll over 70000. In 2010, more than 50000 people died in Russia during a heat wave. Those will become more common and worse. Then you have crop failures, due to drought and extreme weather. Food and water insecurity will force hundreds of millions to migrate, fueling conflicts. You're also right that insect-borne diseases are going to spread more. Prepare for the worst, but work toward the best.