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Following the given statement, two possible causes I and II are provided. Read the statement carefully and determine which cause(s) appropriately explain the event/observation/fact given in the statement. Statement: Global warming is caused by an abnormally rapid rise in the average surface temperature of the earth over the past century, primarily due to human-generated greenhouse gases. Causes: I. The burning of fossil fuels to generate electricity and heat accounts for most global greenhouse gas emissions. II. Deforestation is responsible for global greenhouse gas emissions. It accounts for about 25% of them.
Only I is a possible cause.
Both I and II are possible causes.
Only II is a possible cause.
Neither I nor II is a possible cause.
Both I and II are possible causes.
Identify if the given causes independently or collectively explain the observed global phenomenon; here both human-driven activities like fossil fuel use and deforestation are proven direct contributors to greenhouse gas emissions.
Identify if the given causes independently or collectively explain the observed global phenomenon; here both human-driven activities like fossil fuel use and deforestation are proven direct contributors to greenhouse gas emissions.
Analyze Statement
The statement claims global warming is caused by a rapid increase in human-produced greenhouse gases. Therefore, any factor that contributes significantly to these emissions can be considered a valid cause.
Evaluate Cause I
Fossil fuel combustion for electricity and heat is the primary source of carbon dioxide and other greenhouse gases, making it a direct cause of the phenomenon described in the statement.
Evaluate Cause II
Deforestation reduces the planet's ability to absorb carbon dioxide and releases stored carbon, directly contributing to greenhouse gas levels. This is another significant factor responsible for global warming.
A: Incorrect because it excludes the impact of deforestation. C: Incorrect because it ignores the significant contribution of fossil fuels. D: Incorrect because both I and II are scientifically established primary contributors to global warming.
B is correct because both fossil fuel combustion and deforestation are well-documented primary drivers of the greenhouse gas emissions that lead to global warming.
In 'Cause and Effect' questions, always look for whether the options represent independent factors that contribute to the main effect; if both are verified scientific drivers of the phenomenon, choose 'Both'.
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