for - need to establish global cooperation to mitigate existential threats of nuclear war and combat tipping points - Yanis Varoufakis - third and fourth suggestion - exercise soft power in the United States - Yanis Varoufakis - Yanis Varoufakis laid out the existential reasons why is important to reach out to the social democrats in the US such as Bernie Sanders - without establishing global cooperation, there is no way to prevent - nuclear war and - climate tipping points