It is aiming to be the first high-income country to reach net zero emissions in 2035 and net negative by 2040. Denmark, which the World Happiness Report recognized as the world's second-happiest country, is targeting net zero by 2045 — and net negative by 2050. Thierry Monasse | Getty Images News | Getty ImagesDanish Climate Minister Lars Aagaard said the need for negative emissions was clear. He added that Denmark's ability to achieve net negative emissions would hinge upon policies implemented over the next five to seven years. Sopa Images | Lightrocket | Getty Images

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