It is the suspension of the solid or liquid particles in the air , is known as the aerosol .
The effect of aerosol is , that it reduces the amount of the solar radiations incident on the surface of the Earth , and due to this capacity to reflect the solar radiations , it has a negative impact on the Earth .
An aerosol is a fine suspension of solid or liquid droplets in air or any other gas. They can be natural or man-made. Examples include dust, fog, streams, etc. The size of particles has a major impact on their properties and diameter. Typically smaller than one micron.
As compared to the impact of greenhouse gases these particles don't harm the natural environment in much extend as the GHGs have done so in the geologic period of the earth.
GHGs concentration can form sooty particles and spread to larger distance the methane gas once react with the ozone can destroy it and cause hazardous problems, Impact of carbon monoxide and dioxide on the planet is seen as the impact of coal and industrial wastes.
The answer is III, raising retirement age and building more schools will not affect this situation very much, while paid maternity leave will help raise the birth rate.
