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The agriculture sector is most heavily impacted by climate change due to the greenhouse effect for several reasons. Climate change significantly alters weather patterns, which are crucial for crop growth and livestock health. Increased temperatures can lead to heat stress in plants and animals, negatively affecting yields and productivity. Additionally, altered rainfall patterns can result in either droughts or flooding, both of which can devastate crops.

Moreover, climate change can increase the prevalence of pests and diseases that affect plants and animals, further threatening food security. Agricultural practices are also challenged by the necessity to adapt to these changing conditions, which may require new methods of pest control, irrigation, and crop varieties that are resilient to changing climates.

In contrast, while transportation, manufacturing, and healthcare sectors face their own challenges related to climate change, the direct impact on the agricultural sector, which is largely dependent on stable and predictable climate conditions, makes it the most vulnerable to the ramifications of the greenhouse effect.