# MET 12 Global Climate Change – Lecture 12

## Presentation on theme: "MET 12 Global Climate Change – Lecture 12"— Presentation transcript:

MET 12 Global Climate Change – Lecture 12
Transportation Shaun Tanner San Jose State University

Greenhouse Gas Emissions Transportation~ 30% of all end use emissions
That there is a link between CO2 and global temperatures is irrefutable as this diagram shows, but exact details of the link and all the possible feedback mechanisms are not clear. The interaction of positive and negative feedback effects associated with the greenhouse effect is currently a critical issue for the scientific community. Transportation~ 30% of all end use emissions

Climate Solutions Transport Housing Food

Burrito (Beef): 850 calories: \$6.10
Burrito (Veggie): 830 calories: \$5.75 Calories per dollar: 140 CO2: 3.8 kg CO2 per dollar: 636 Calories per dollar: 145 CO2: 0.5 kg CO2 per dollar: 94

How far can you travel on a burrito?

Driving 55 In 1974 55 mph national speed limit law passed
2% reduction in highway fuel consumption lives saved annually Law altered in 1987 and repealed in 1995 That there is a link between CO2 and global temperatures is irrefutable as this diagram shows, but exact details of the link and all the possible feedback mechanisms are not clear. The interaction of positive and negative feedback effects associated with the greenhouse effect is currently a critical issue for the scientific community.

10 to the 15 BTU of energy = quad

Miles per gallon

Highway Speed Limits

Fuel efficiency versus speed

Assignment Campaign to reduce highway speed limit 1. Calculate fuel and CO2 emissions for bay area trip to Lake Tahoe (and return) driving at a speed of 55 mph and 75 mph. 2. Calculate equivalent measures: plastic bottles, plastic bags, burritos and iPods 3. Write a pitch (1 paragraph) advocating for speed limit reduction That there is a link between CO2 and global temperatures is irrefutable as this diagram shows, but exact details of the link and all the possible feedback mechanisms are not clear. The interaction of positive and negative feedback effects associated with the greenhouse effect is currently a critical issue for the scientific community.

Data San Jose to Lake Tahoe = 230 miles Avg vehicle: 35 mpg @ 55 mph
1 gallon of gas burned = 20 lbs of CO2 1 water bottle ~ 1.7 lbs of CO2 1 plastic bag ~ 0.14 lbs of CO2 1 iPod ~ 50 lbs of CO2 1 veggie burrito ~ 1.1 lbs of CO2 1 beef burrito ~ 8.4 lbs of CO2 22.6 million licensed drivers in CA 10,000 miles per person