Question

some scientists predict that we may soon run out of coal, oil, and natural gas. in addition, they are costly sources of energy. worst of all, using these resources pollutes the air, land, and water.
there are more than seven billion people on earth. and the number keeps rising. as the population grows, so does our need for energy. many experts say we need to choose cleaner sources of energy. otherwise, our energy problems will continue to grow.
identify main idea and supporting details
drag and drop a word from the text to complete this sentence.
experts say we need to use cleaner sources of energy in order to avoid the ______ caused by using coal, oil, and natural gas.
drag word here
save & continue

Explanation:

El texto menciona que usar carbón, petróleo y gas natural causa contaminación (pollutes the air, land, and water). La oración a completar se refiere a lo que se debe evitar al usar estas fuentes de energía, por lo que la palabra adecuada es "pollution".

Answer:

pollution