Question

which human activity contributes most directly to global warming? burning fossil fuels recycling paper planting trees using wind power

Explanation:

To determine which human activity contributes most to global warming, we analyze each option:

• Burning fossil fuels (like coal, oil, gas) releases large amounts of greenhouse gases (e.g., CO₂), a primary driver of global warming.
• Recycling paper reduces waste and resource use, helping mitigate warming.
• Planting trees absorbs CO₂, reducing greenhouse gases.
• Using wind power is a clean energy source, decreasing reliance on fossil fuels.

Among these, burning fossil fuels has the most direct and significant impact on increasing greenhouse gas concentrations and global warming.

Answer:

Burning fossil fuels (the first option in the list of choices)