Milestone 1: Variables

Insert a start and an end block. Set variables for carbon dioxide and methane. Carbon dioxide should be equal to 200 ppm. Methane should be equal to 1800 ppb.

Hint: Use blocks from the "Control" and "Measurements" tabs.

Click run once you think your blocks are correct!

Milestone 2: Earth Decisions

These blocks are set up incorrectly. They should contain an if statement that checks if carbon dioxide is above 200 ppm, and if so melt ice. Fix the blocks.

Then, change the carbon dioxide value to 20. What happens?

Then, change the carbon dioxide value to 400. What happens?

Hint: Include blocks in the "Decisions" tab.

Click run once you think your blocks are correct!

Milestone 3: Atmosphere Decisions

Set the value of methane to be zero.

Include an if statement that checks whether there is methane in the atmosphere. If there is not, change the way the atmosphere looks to reflect having only carbon dioxide.

Hint: The effects blocks do not change the values of variables, but they do change the way the earth or atmosphere looks .

Click run once you think your blocks are correct!

Milestone 4: Repeated Actions/Effects

Set a carbon dioxide variable to be 200. Include a while loop that changes the value of carbon dioxide by 200 until it is equal to 600. What should happen as the value of carbon dioxide concentration increases in this way?

Beware of the infinite loop! This means, make sure you are changing the value of the variable along with adding effects.

Hint: The effects blocks do not change the values of variables, but they do change the way the earth or atmosphere looks .

Click run once you think your blocks are correct!