Does the presence of aerosols cause global temperatures to increase or decrease

decrease

Explanation:

The aerosols have a reverse effect from that of the greenhouse gases. The effect of them is decreasing of the temperature on a global scale, so we can say that it causes an equally big danger, if not bigger one, than that of the greenhouse gases. The aerosols have the property to scatter the light, change the Earth's reflectivity, and are creating clouds. The scattering of the light and change of the reflectivity of the Earth cause much more weakened and dispersed light, thus causing lesser heating of the Earth and its atmosphere. The formation of clouds too has its effect, as the clouds formed by the aerosols are almost impenetrable for the light, weakening it a lot, so the places below these clouds experience sudden drastic drops in the temperature.

your answer is a. hope this : )