English Reading Comprehension — quick quiz

Read the passage and answer the question. Climate change is one of the most pressing challenges facing humanity today. Rising global temperatures are causing glaciers to melt, sea levels to rise and weather patterns to become increasingly unpredictable. The primary cause of climate change is the emission of greenhouse gases, particularly carbon dioxide, from burning fossil fuels. Developing countries are especially vulnerable to the effects of climate change, as they often lack the resources to adapt to changing conditions. International cooperation and immediate action are essential to mitigate the worst effects of climate change and protect future generations. Question: According to the passage, why are developing countries especially vulnerable to climate change?