EARTH CLIMATE: FINAL HELD-OUT TOPIC
Greenhouse gases absorb and emit infrared radiation, affecting how energy moves through Earth's atmosphere. The natural greenhouse effect helps keep Earth warmer than it would otherwise be. Increasing greenhouse gas concentrations changes the planet's energy balance.

Human activities, especially burning fossil fuels, have increased atmospheric carbon dioxide. The current warming trend is primarily driven by human greenhouse gas emissions. Measurements and physical explanations support this conclusion.

Weather varies over short periods. Climate describes patterns over longer periods. A single cold day does not establish the absence of global warming. Specific regional changes can involve several influences, so an explanation should distinguish the broad mechanism from a local prediction.

Source: https://science.nasa.gov/climate-change/causes/
This held-out passage evaluates text prediction on a topic excluded from training. It is too short to establish a model's factual reliability or general scientific ability.