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sea lamprey, round goby, purple
loosestrife, zebra mussels, and the Eurasian ruffe

Over the past 50 years, humans have changed ecosystems more rapidly and extensively than in any comparable period of time in human history, largely to meet rapidly growing demands for food, freshwater, timber, fiber and fuel. This has resulted in a substantial and largely irreversible loss in thediversity of life on Earth.

contributed to substantial net gains in human well-being and economic development, but these gains have been achieved at growing costs in the form of the degradation of many ecosystem services

The steeply accelerating decline of the natural world is already costing hundreds of billions of pounds a year, say leading economists, in a review of the costs and benefits of forests, rivers and marine life. The losses will increase dramatically over the next generation unless urgent remedial action is taken, they say.

world has lost 40% of its forests in 300 years,

finely balanced

self-sustaining