If humans hadn't made progress, they wouldn't have moved to the cities. If humans hadn't moved to the cities, industries wouldn't have developed. If the industries hadn't developed, the cities wouldn't have grown in population. If the cities hadn't grown in population, they wouldn't have grown in size. If the cities hadn't grown in size, people wouldn't have needed more electricity, cars and other products. If people hadn't needed more electricity, cars and other products, industries wouldn't have grown. If industries hadn't grown, more fuels wouldn't have burnt. If more fuels hadn't been burnt, more greenhouse gases wouldn't have been produced. If more greenhouse gases hadn't been produced, more heat wouldn't have accumulated in the atmosphere. If more heat hadn't accumulated in the atmosphere, the temperature of the Earth wouldn't have risen. If the temperature of the Earth hadn't risen, humans wouldn't have damaged the Earth. If humans hadn't damaged the Earth, they wouldn't have become an endangered species.
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If humans hadn't made progress, they wouldn't have moved to the cities.If humans hadn't moved to the cities, industries wouldn't have developed.
If the industries hadn't developed, the cities wouldn't have grown in population.
If the cities hadn't grown in population, they wouldn't have grown in size.
If the cities hadn't grown in size, people wouldn't have needed more electricity, cars and other products.
If people hadn't needed more electricity, cars and other products, industries wouldn't have grown.
If industries hadn't grown, more fuels wouldn't have burnt.
If more fuels hadn't been burnt, more greenhouse gases wouldn't have been produced.
If more greenhouse gases hadn't been produced, more heat wouldn't have accumulated in the atmosphere.
If more heat hadn't accumulated in the atmosphere, the temperature of the Earth wouldn't have risen.
If the temperature of the Earth hadn't risen, humans wouldn't have damaged the Earth.
If humans hadn't damaged the Earth, they wouldn't have become an endangered species.