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I give you two prompts for this week's discussion. You have to post a discussion on one of these prompts, but you have the option to reply to either a discussion or an assignment topic this week (or both).

The first being the limitations of the various studies that were discussed on pg 115-116. Why is it important to discuss these limitations with the students?

Explain how the sensitivity of organism's carbon dioxide sensing organs means that small changes can have large impacts. It has been said that greenhouse gases make up such a small portion of the atmosphere that they shouldnt have such an impact, so then why do we bother to measure things on the ppm, ppb, or even ppt scale?