Homework A2 L04

Read the story and pick the right answer.

1. Read paragraph D, Why would sea levels rise because of global warming?

Global Warming

(A)Global warming refers to the increase of the earth's average temperature due to increasing amounts of greenhouse gases in the atmosphere. Carbon dioxide is the biggest contributor to greenhouse gas emissions.

Scientists agree that the burning of fossil fuels like oil and coal causes greenhouse gases such as carbon dioxide to escape into the air and act like a warm blanket over the earth.

(B) There are already some changes happening because of global warming. Sea level is rising and some animals are moving to new homes because their natural habitat is disappearing.

(C) If the warming gets worse, as scientists expect, there may be some kinds of plants and animals that become extinct. Heatwaves and droughts will increase, leading to wildfires, and some areas may become too dry for farming.

(D) Warmer ocean temperatures lead to more big storms which damage homes and cause floods. Sea levels may rise so much that people have to move away from the coasts.

(E) All humans contribute to global warming by burning fossil fuels when they drive a car, fly in an airplane, heat or cool their houses, and cut down trees to clear land.

(F) One way to reduce greenhouse gases is to reduce deforestation, the cutting down of trees. Trees soak up carbon dioxide from the air, so having lots of trees around is good for the atmosphere. We can also plant more trees.

(G) The best way to help slow down global warming is to put less carbon into the air by using less fossil fuel - something that is easy to say, but hard to do! But by driving less, turning down the heat and air conditioning, and using more solar, wind, and hydroelectric power, we can all reduce greenhouse gases and help fight global warming.

• 1. water pollution

• 2. warming waters and melting of the polar ice caps

• 3. too many large ships

Read the story and pick the right answer.

2. Read paragraph f. What is deforestation?

Global Warming

(A)Global warming refers to the increase of the earth's average temperature due to increasing amounts of greenhouse gases in the atmosphere. Carbon dioxide is the biggest contributor to greenhouse gas emissions.

Scientists agree that the burning of fossil fuels like oil and coal causes greenhouse gases such as carbon dioxide to escape into the air and act like a warm blanket over the earth.

(B) There are already some changes happening because of global warming. Sea level is rising and some animals are moving to new homes because their natural habitat is disappearing.

(C) If the warming gets worse, as scientists expect, there may be some kinds of plants and animals that become extinct. Heatwaves and droughts will increase, leading to wildfires, and some areas may become too dry for farming.

(D) Warmer ocean temperatures lead to more big storms which damage homes and cause floods. Sea levels may rise so much that people have to move away from the coasts.

(E) All humans contribute to global warming by burning fossil fuels when they drive a car, fly in an airplane, heat or cool their houses, and cut down trees to clear land.

(F) One way to reduce greenhouse gases is to reduce deforestation, the cutting down of trees. Trees soak up carbon dioxide from the air, so having lots of trees around is good for the atmosphere. We can also plant more trees.

(G) The best way to help slow down global warming is to put less carbon into the air by using less fossil fuel - something that is easy to say, but hard to do! But by driving less, turning down the heat and air conditioning, and using more solar, wind, and hydroelectric power, we can all reduce greenhouse gases and help fight global warming.

• 1. the cutting down of trees

• 2. the planting of trees

• 3. a station set up to measure CO2 in the forest

Read the story and pick the right answer.

3. Read paragraph A. Which of these is the biggest contributor to greenhouse gas emissions?

Global Warming

(A)Global warming refers to the increase of the earth's average temperature due to increasing amounts of greenhouse gases in the atmosphere. Carbon dioxide is the biggest contributor to greenhouse gas emissions.

Scientists agree that the burning of fossil fuels like oil and coal causes greenhouse gases such as carbon dioxide to escape into the air and act like a warm blanket over the earth.

(B) There are already some changes happening because of global warming. Sea level is rising and some animals are moving to new homes because their natural habitat is disappearing.

(C) If the warming gets worse, as scientists expect, there may be some kinds of plants and animals that become extinct. Heatwaves and droughts will increase, leading to wildfires, and some areas may become too dry for farming.

(D) Warmer ocean temperatures lead to more big storms which damage homes and cause floods. Sea levels may rise so much that people have to move away from the coasts.

(E) All humans contribute to global warming by burning fossil fuels when they drive a car, fly in an airplane, heat or cool their houses, and cut down trees to clear land.

(F) One way to reduce greenhouse gases is to reduce deforestation, the cutting down of trees. Trees soak up carbon dioxide from the air, so having lots of trees around is good for the atmosphere. We can also plant more trees.

(G) The best way to help slow down global warming is to put less carbon into the air by using less fossil fuel - something that is easy to say, but hard to do! But by driving less, turning down the heat and air conditioning, and using more solar, wind, and hydroelectric power, we can all reduce greenhouse gases and help fight global warming.

• 1. carbon dioxide

• 2. carbon monoxide

• 3. oxygen

Read the story and pick the right answer.

4. Read paragraph G. What's the best way to slow down global warming?

Global Warming

(A)Global warming refers to the increase of the earth's average temperature due to increasing amounts of greenhouse gases in the atmosphere. Carbon dioxide is the biggest contributor to greenhouse gas emissions.

Scientists agree that the burning of fossil fuels like oil and coal causes greenhouse gases such as carbon dioxide to escape into the air and act like a warm blanket over the earth.

(B) There are already some changes happening because of global warming. Sea level is rising and some animals are moving to new homes because their natural habitat is disappearing.

(C) If the warming gets worse, as scientists expect, there may be some kinds of plants and animals that become extinct. Heatwaves and droughts will increase, leading to wildfires, and some areas may become too dry for farming.

(D) Warmer ocean temperatures lead to more big storms which damage homes and cause floods. Sea levels may rise so much that people have to move away from the coasts.

(E) All humans contribute to global warming by burning fossil fuels when they drive a car, fly in an airplane, heat or cool their houses, and cut down trees to clear land.

(F) One way to reduce greenhouse gases is to reduce deforestation, the cutting down of trees. Trees soak up carbon dioxide from the air, so having lots of trees around is good for the atmosphere. We can also plant more trees.

(G) The best way to help slow down global warming is to put less carbon into the air by using less fossil fuel - something that is easy to say, but hard to do! But by driving less, turning down the heat and air conditioning, and using more solar, wind, and hydroelectric power, we can all reduce greenhouse gases and help fight global warming.

• Work all the air conditioners harder.

• Use more coal.

• Use less fossil fuel.

Read the story and pick the right answer.

5.Read paragraph A. What is global warming?

Global Warming

(A)Global warming refers to the increase of the earth's average temperature due to increasing amounts of greenhouse gases in the atmosphere. Carbon dioxide is the biggest contributor to greenhouse gas emissions.

Scientists agree that the burning of fossil fuels like oil and coal causes greenhouse gases such as carbon dioxide to escape into the air and act like a warm blanket over the earth.

(B) There are already some changes happening because of global warming. Sea level is rising and some animals are moving to new homes because their natural habitat is disappearing.

(C) If the warming gets worse, as scientists expect, there may be some kinds of plants and animals that become extinct. Heatwaves and droughts will increase, leading to wildfires, and some areas may become too dry for farming.

(D) Warmer ocean temperatures lead to more big storms which damage homes and cause floods. Sea levels may rise so much that people have to move away from the coasts.

(E) All humans contribute to global warming by burning fossil fuels when they drive a car, fly in an airplane, heat or cool their houses, and cut down trees to clear land.

(F) One way to reduce greenhouse gases is to reduce deforestation, the cutting down of trees. Trees soak up carbon dioxide from the air, so having lots of trees around is good for the atmosphere. We can also plant more trees.

(G) The best way to help slow down global warming is to put less carbon into the air by using less fossil fuel - something that is easy to say, but hard to do! But by driving less, turning down the heat and air conditioning, and using more solar, wind, and hydroelectric power, we can all reduce greenhouse gases and help fight global warming.

• a rise in temperature in the earth's core

• when the average air temperature reaches 80°F

• the earth heating due to build-up of greenhouse gases