Fill in the paragraph.

Substances called_____are important because they act as a blanket to keep ____ In our atmosphere. However, human activities can ___ the concentrations of greenhouse gases in the atmosphere so much that they keep too much thermal energy in the atmosphere. This causes global temperatures to ___ , which is a phenomenon called ___ This phenomenon is one contributing factor to changes in long-term weather patterns known as _____.

Substances called greenhouse gases are important because they act as a blanket to keep heat in our atmosphere. However, human activities can increase the concentrations of greenhouse gases in the atmosphere so much that they keep too much thermal energy in the atmosphere. This causes global temperatures to rise, which is a phenomenon called global warming. This phenomenon is one contributing factor to changes in long-term weather patterns known as climate change.