It's the poorer people in tropical zones who will get really hit by climate change - as well as some ecosystems, which nobody wants to see disappear.
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Beyond the borders of wealthy countries like the United States, in developing countries where most people in the world live, the impacts of climate change are much more deadly, from the growing desertification of Africa to the threats of rising sea levels and the submersion of small island nations.
As species are exterminated by shifting climate zones, ecosystems can collapse, destroying more species.
The saddest fact of climate change - and the chief reason we should be concerned about finding a proper response - is that the countries it will hit hardest are already among the poorest and most long-suffering.
Around the world, climate change is an existential threat - but if we harness the opportunities inherent in addressing climate change, we can reap enormous economic benefits.
Though Africa is not responsible for emitting greenhouse gases, it is suffering the consequences of climate change.
It's coming home to roost over the next 50 years or so. It's not just climate change; it's sheer space, places to grow food for this enormous horde. Either we limit our population growth or the natural world will do it for us, and the natural world is doing it for us right now.
As an explorer, I know firsthand there are many places in the ocean so full of life that they should be protected. Coral reefs and mangrove coastlines are stressed already by climate change and ocean acidification, and poor planning will just make their plight worse.
We have serious challenges regarding climate change, unsustainable use of natural resources, water scarcity, loss of biodiversity, forests and farmland. Not to mention the huge inequality still prevailing in several parts of the planet.
The tropical rain forests are a telling example. Once cut down, they rarely recover. Rainfall drops, deserts spread, the climate warms.
Global climate change has a profound impact on the survival and development of mankind. It is a major challenge facing all countries.
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