There are a number of things humans are doing to protect ecosystems. From the earthtrends website:
“governments have established protected areas to manage threatened ecosystems and ecosystem services, protect species from extinction, and to maintain cultural diversity and resources. To date, more than 98,000 nature reserves, national and state parks, protected landscapes, and managed resource areas have been established to protect more than 10 percent of the earth’s terrestrial surface. In addition, more than 3800 marine protected areas have been established to protect marine biodiversity and fisheries worldwide”
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