*Ripped from the Headlines, Part Deux!*

CO2 levels the highest ever measured. The last time there was this much CO2 in the air, Titanis terror birds roamed the Earth.

An extra tidbit: a study surveying half a million workers found that physically demanding jobs will help you live longer.

**Warmup Question:** Why are Bioswales an example of green building? (responses)

Apply table and graph reading skills to solve three green trades math problems:

What follows are the procedures for calculating how green a building is.

#### Green Math Calculations

Let’s start with

**Heat Transfer through a Wall**. You’ll need to find three numbers:

- The Thermal Conductivity number, given building material.
- The Area the heat gradient is going through. We will use one of three rooms.
- The “delta T” — the change in temperature. Each problem will give you two temperatures. Do the takeaway.

And now **Solar Panels**. You’ll need to find, … another three numbers:

- The Insolation number, given city and month.
- The number of daylight hours.
- The area of the solar panel in square meters.

And finally, **Heat Pumps**. Another three numbers:

- Mass Flow Rate. Given in the problem.
- Heat Capacity of the coolant.
- Another delta T.

That’s it for Green Trades Math.