what is the most likely source of the increase in carbon dioxide in the atmosphere shown in the graph above

I'm pretty sure its burning fossil fuels and stuff like that

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

i do believe the correct answer would be the third one. location c, because earth is tilted away from the sun at this time

hope this