Increasing levels of CO2 is one of the driving factors for global climate change. This same CO2 also happens to be vital for plant growth via photosynthesis. As a result, fast-growing plants, such as poison ivy, are actually becoming more abundant and more hazardous.
If you were eaten by a frog, how would you survive? Well, these water beetles survive by swimming 'downstream'.
And lastly, here is a link to provide you nightmares of swarms of fungus gnat larvae.