Answer: global warming
Explanation:
Global warming is simply referred to as the long-term heating of the surface of the Earth and this is caused by human activities, and also the burning of primarily fossil fuel, which brings about the pumping of carbon dioxide, greenhouse gases and air pollutants into the atmosphere.
The weatherizing of buildings to reduce heat loss and save on fuel costs has led to an increase in global warming.
It would decrease, because the producers are the source of food for the herbivores
Poison Ivy. They are plants and can make their own food aka Glucose.