A net of nations withdrawing from the deal could trigger the withdrawal of more governments and lead to a total collapse of the deal.  The countries most affected by the effects of climate change will be low-lying countries that are particularly vulnerable to sea-level rise and developing countries that do not have the resources to adapt to changes in temperature and precipitation. But rich countries like the United States are also increasingly vulnerable. In fact, several million Americans — especially children, the elderly, and the poor — are already suffering from the wrath of climate change. Although only national governments are directly involved in the negotiations, COP 21 provided many opportunities to showcase the contributions of “non-state actors” to global climate efforts. The strong demonstration of commitments by cities, subnational governments and businesses at the New York Climate Summit in September 2014 led to the creation of the Lima-Paris Programme of Action and the Non-State Actor Zone for Climate Action (NAZCA)NAZCA online portal at COP 20, where non-state actors can register their commitments. At the time of Paris, the portal listed nearly 11,000 commitments from 2,250 cities, 22,025 companies and hundreds of states/regions, investors and civil society organizations. The unprecedented display of action and support at all levels of society has been widely regarded as an important factor in the success of Paris. .