Climate change, characterized by long-term shifts in global temperatures and weather patterns primarily due to anthropogenic greenhouse gas emissions, poses an existential threat to global food security and significantly impedes poverty eradication efforts. It acts as a 'threat multiplier,' exacerbating existing vulnerabilities and creating new challenges, particularly for the world's poorest populations.

Impact on Global Food Security:

1. Reduced Agricultural Yields: Extreme weather events like prolonged droughts, intense floods, and heatwaves directly damage crops and reduce agricultural productivity. For example, recurrent droughts in sub-Saharan Africa devastate staple crops, while heat stress reduces wheat yields in major producing regions. Changes in rainfall patterns also disrupt traditional farming calendars.
2. Increased Pests and Diseases: Warmer temperatures expand the geographical range and lifecycle of agricultural pests and plant diseases, leading to greater crop losses. Ocean warming and acidification also negatively impact marine ecosystems, threatening fish stocks, a crucial protein source for many coastal communities.
3. Water Scarcity: Altered precipitation patterns, melting glaciers, and increased evaporation contribute to water scarcity, severely affecting irrigated agriculture, especially in already water-stressed regions.
4. Food Price Volatility: Supply shocks caused by climate-related disasters lead to sharp increases in food prices, making essential foodstuffs unaffordable for low-income households and pushing more people into hunger.
5. Disruption of Supply Chains: Extreme weather events can damage infrastructure, disrupting transportation and distribution networks, leading to food waste and reduced access to markets.

Impact on Poverty Eradication:

1. Loss of Livelihoods: Millions of smallholder farmers, fishers, and pastoralists, who are often among the poorest, depend directly on climate-sensitive natural resources. Climate change destroys their crops, livestock, and fishing grounds, leading to loss of income, assets, and increased indebtedness.
2. Increased Health Burdens: Climate change contributes to malnutrition, waterborne diseases (due to floods and contaminated water), and heat-related illnesses. The poor, with limited access to healthcare and sanitation, are disproportionately affected, leading to higher mortality rates and reduced productivity.
3. Displacement and Migration: Climate-induced disasters force communities to abandon their homes and livelihoods, creating 'climate refugees.' This displacement often leads to further economic instability, social disruption, and increased poverty in both origin and destination areas.
4. Reduced Economic Growth: Damage to infrastructure, decreased agricultural output, and increased health costs divert national resources from development initiatives towards disaster response and recovery, hindering overall economic growth and progress towards poverty reduction goals.
5. Exacerbation of Inequalities: The poor have the least capacity to adapt to climate change impacts due to limited financial resources, lack of insurance, and inadequate social safety nets. This widens the gap between the rich and the poor, making poverty eradication an even more elusive goal.

Critical Examination: The interconnectedness of climate change, food security, and poverty means that progress in one area is contingent on progress in the others. Climate change not only threatens to reverse decades of development gains but also creates new cycles of poverty and vulnerability. Effective solutions require a holistic approach, integrating climate-resilient agriculture, sustainable resource management, robust social protection systems, and significant investments in adaptation and mitigation strategies, particularly in developing countries. Without concerted global action to reduce emissions and support adaptation, achieving global food security and eradicating poverty will remain an insurmountable challenge.