Climate Change

noun a combustible black or dark brown rock consisting chiefly of carbonized plant matter, found mainly in underground deposits and widely used as fuel

• Coal is a fossil fuel that is commonly used for electricity generation.
• My grandfather used to work in the coal mines when he was younger.
• I'm so tired, I feel like I've been coal mining all day.
• His heart was as black as coal after what he did.

noun a flammable gas, consisting largely of methane and other hydrocarbons, occurring naturally underground and used as fuel

• The country relies heavily on natural gas as a source of energy.
• We use natural gas to heat our home during the winter.
• I love cooking with natural gas because it's so efficient.
• Her laughter was like a burst of natural gas, filling the room with warmth and light.

noun a vast, flat, treeless Arctic region of Europe, Asia, and North America in which the subsoil is permanently frozen

• The tundra biome is characterized by low temperatures and permafrost.
• I heard that the tundra is really cold all year round.
• The tundra is like a frozen wasteland, dude.
• Her heart felt like a tundra, cold and barren.

noun The Pleistocene is a geological epoch that lasted from about 2.6 million to 11,700 years ago, characterized by multiple ice ages and the presence of early humans.

adjective Pleistocene can also be used as an adjective to describe things related to or characteristic of this geological epoch.

• The Pleistocene epoch lasted from about 2.6 million to 11,700 years ago.
• Did you know that mammoths roamed the Earth during the Pleistocene period?
• Back in the Pleistocene days, things were totally different.
• Her fashion sense is so outdated, it's like she's stuck in the Pleistocene era.

noun a geological era that lasted from about 252 to 66 million years ago, known for the dominance of dinosaurs

• The Mesozoic era is known for the dominance of dinosaurs and the rise of flowering plants.
• Back in the Mesozoic times, dinosaurs ruled the earth.
• The Mesozoic period was like, totally the heyday for dinosaurs.
• Exploring the Mesozoic era is like stepping into a time machine to witness the reign of ancient creatures.