There are some ways you could connect Earth systems and climate change topics to my current curriculum and it is on our Unit called- Matter and Energy in Organism. Part of this unit talks includes about Air, Climate, and Nutrient Cycles as well as photosynthesis and respiration.
Some examples of climate change evidence to my to students/visitors would respond to or be witnesses to in their our communities are: global warming which is caused by burning of fossil fuels, deforestation and carbon dioxide emissions. Another one is the change in temperature where we gets warmer or cooler which affects the weather patterns.