Choose the sentence that best combines each pair of sentences given.

Fossil fuels come from dead plants and animals. These plants and animals died millions of years ago.

The environment has been made catastrophic by global warming.

It is true that global warming is a catastrophe caused by the environment.

It has been proven that global warming is harmful to the environment.

The environment has been truly dangerous because of global warming.

It is alarming that deforestation damages the quality of the land.

The quality of the land deteriorates as the result of the alarming rate of deforestation.

The alarming rate of deforestation results from damage to the quality of the land.

The damage to the quality of the land is to blame for the alarming rate of deforestation.

Numerous catastrophic consequences result in climate change.

Numerous catastrophic consequences result from climate change.

Climate change results from numerous catastrophic consequences.

Numerous catastrophic consequences cause climate change.

Heat-related illnesses result from the increase in earth’s temperature.

Heat-related illnesses result in the increase in earth’s temperature.

Heat-related illnesses lead to the increase in earth’s temperature.

Heat-related illnesses trigger the increase in earth’s temperature.

Some animals go extinct due to changes in climate where they live.

Climate changes make some animals go extinct where they live.

The climate changes where some animals there go extinct.

That some animals go extinct causes the climate where they live to change.

They were praised for having decided to decrease their carbon footprints.

They were not punished for having decided to decrease their carbon footprints.

Unless they decided to cut down their carbon footprints, they were praised for that.

If they decided to cut down their carbon footprints, they would be praised for that.

We can no longer remember having advised you on how to decrease your energy use.

We remember having advised you on how to maintain your energy use.

We remember having advised you on how to decrease your energy use.

We remember to have advised you on how to decrease your energy use.