A good science education is supposed to give you enough background to understand why claims are likely true. You don't need to be an expert to understand the reasons why these are factual.
CO2 is a greenhouse gas, meaning it prevents the Earth from radiating heat captured from the sun. We know this for many reasons, one of which is that Venus has an atmosphere that's high in CO2 and it's the hottest planet in our solar system: over 800 degrees F. We know that burning fossil fuels puts CO2 in the atmosphere and we can use CO2 levels in glaciers to measure historical CO2 levels.
Given this, the statement that Earth's temperature increase can be contributed to pollution makes sense.
We know that plants and animals can change their physiology over time through breeding. If someone continuously inter-breeds the largest dogs from packs, then over several generations, the average size of these dogs will increase. Expanding this idea from 10s of generations to millions of generations, it's clear that these genetic changes could get diverse enough to create a completely different animal.
Given this, the process of evolution makes plenty of sense.
Believing these things doesn't make you more intelligent. However, it does demonstrate that you were better educated and developed better critical thinking skills as a result. The definition of critical thinking is being willing to reject an assertion if the known evidence doesn't support it.