CAUSE-EFFECT.

CAUSE	EFFECT
Pneumonic diseases increased.	Many children died due to respiratory diseases.
Coal was burned and it produced toxic gases.	The planet is affected by global warming.
Factories polluted rivers and canals with sewage and industrial waste.	Many fish died from the pollution of their habitat.
57.000 people were killed by the cholera epidemic.	The world's cities were put on alert to control the epidemic.
Emissions from coal-powered plants resulted in acid rain.	Acid rain affect soil fertility by erosion.