"In China, waste is growing twice as fast as the population," the lecturer said.

“We're staying in tonight," said Emily.

"We went to work yesterday," she said.

"You'd better not waste your time, Tommy," Mum said.

“We saw a strange man in the garden," they told their son.

"What happens to what we throw away?" Many wonder.

"I've bought a ring," he said to his girlfriend.

Biodiversity has its own economic importance. Protection of biodiversity is important.

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Trees should be planted everywhere possible. Trees absorb carbon dioxide, a greenhouse gas.

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