evidence: - Without adaptive measures, the number of people who lack sufficient water for at least one month per year will soar from 3.6 billion today to more than 5 billion by 2050. [...] Sources: IPCC - The unsustainable use of land, soil, water and energy for food contributes to greenhouse gas emissions that cause rising temperatures. Higher temperatures in turn affect resources to produce food. Up to 811 million people in the world faced hunger in 2020, as many as 161 million more than in 2019.