The responses that apply to why it is not surprising that 2016 was the third year in a row with record-high surface temperatures, considering the greenhouse effect, are:
-
The air around Earth acts like a blanket, trapping heat from the sun. When we burn fossil fuels like coal and gas, it adds more of these heat-trapping gases to the air. This extra heat makes Earth's surface warmer over time. So, it's not surprising that 2016 was the third year in a row with the hottest temperatures on record, because we're making the Earth warmer by adding more of these gases.
-
Sometimes, Earth's temperature can change naturally because of things like big weather patterns (like El Niño) or changes in how much heat the sun gives off. These natural changes can also make some years hotter without it always meaning the climate is getting warmer overall.
The first response emphasizes the role of human activity in adding greenhouse gases and contributing to the overall warming trend, making it unsurprising that we see consecutive years of record temperatures. The second response explains the influence of natural variability, indicating that while some years may be hotter due to natural factors, the ongoing trend is primarily driven by human-induced climate change.
The other options primarily focus on local weather patterns or natural changes without directly addressing the broader understanding of climate change as influenced by greenhouse gas emissions.