A treaty designed to protect the ozone layer via phasing out the production of multiple substances responsible for the ozone layer depleting.
Producers are always found at the lowest trophic level because they are the foundation of the foodweb. Which means that in the ocean you will find producers like algae and fungi because they dwell in the bottom as producers.
If we start o war people will die and the population will decrease. If we pollute the air and water there will be less to drink and eat and there will be more floods. This will cause the population to decrease because there will be more deaths.

The Energy required for photosynthesis is absorbed by plants through green pigments known as Chlorophyll, in the form of Sunlight which is later used up during photosynthesis to produce Glucose.

Antagonsitic effect/interaction/response
In order to combat antiobiotic resistance, and to possibly enhance the activity of antibiotics, they are sometimes used in combinations during treatment. However, three possible responses or effects can manifest.
First is antibiotic synergy, where the combined effect of the antibiotics enhances the activity/potency of the treatment compared to when the antibiotics are administered singly.
The effect is also distinguished from another type of response, which is additive effect, where the combined effect of the antibiotics is more or less equal to the combined activity/potency of each of the antibiotic when applied singly. Antibiotic synergy results in even greater enhancement of the activity of the combined antibiotics compared to additive effect.
Lastly, there is the antagonistic effect or response, where the combined effect of the antibiotics results in the weakening of the potencies of the antibiotics relative to the combined (additive effect) potencies of each of the antibiotics.