✓ Accepted Answer
Climate change refers to long-term shifts in global temperatures and weather patterns. While Earth's climate has always varied naturally, since the Industrial Revolution human activities — primarily burning fossil fuels — have accelerated warming dramatically.
Burning coal, oil, and gas releases CO2 and other greenhouse gases. These gases trap heat from the sun within Earth's atmosphere — the greenhouse effect. Without any greenhouse gases, Earth would be a frozen wasteland. With too many, temperatures rise beyond what ecosystems and human society can adapt to quickly.
Since 1880, global average temperature has risen about 1.2°C. This may sound small but represents enormous energy added to the climate system. Effects include more frequent and intense extreme weather events, rising sea levels from melting ice sheets, disrupted ecosystems, and threats to agriculture and water supplies.
The scientific consensus is overwhelming — 97% of climate scientists agree on the human cause. The disagreement is political, not scientific. The question is how fast we transition to clean energy and whether we can limit warming to 1.5-2°C above pre-industrial levels.
by liyagebre37157
The human brain contains roughly 86 billion neurons connected by about 100 trillion synapses — connections between neurons. Information travels as electrical impulses along neurons and chemical signals across synapses.
Different regions specialise in different functions. The prefrontal cortex handles planning, decision-making, and personality. The hippocampus forms and retrieves memories. The amygdala processes emotions, particularly fear. The cerebellum coordinates movement and balance. The brainstem controls basic survival functions like breathing and heart rate.
Memory isn't stored in one location but distributed across networks. Long-term memories form through synaptic strengthening — when neurons repeatedly fire together, their connections strengthen, which is why practice and repetition improve memory. Sleep is critical for consolidating memories from short-term to long-term storage.
The brain is remarkably plastic, especially in youth. It reorganises in response to experience and learning. Neuroplasticity continues in adulthood, though more slowly. This is why learning new skills at any age remains beneficial and why stroke rehabilitation can be effective.
by nanaopoku94811
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