Examples of how conditions on earth would worsen if greenhouse gases increase.

Well, greenhouse gases are gases released to the atmosphere that cause the heating of earth's atmosphere, and therefore the heating of earth's surface.

- When Earth's surface start heating whole ecosystems will suffer since temperature infleunces a lot on these.

- The ice caps in our poles will melt, rising the ocean levels and casuing possible floods.

- Water will be more scarce since it'll evaporate quicker due to increased temperatures.

Hope it helped,

BioTeacher101

where is the option.let me know

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.