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When living creatures breathe out and when things (to be burned), carbon dioxide (to enter) the atmosphere.
The destruction of forests (to mean) that there (to be) fewer trees to convert carbon dioxide into oxygen.
Many experts (to believe) that the Greenhouse Effect (to bring) significant changes to the Earth’s climate, though they all (not agree) how long this will take.
Thousands of species (to become) instinct and many more (to be) now endangered.
Solar power (always to give) us light and heat, but now, thanks to solar technology, we (to find) ways to store and use this power.