公司總裁Tim召集部門經理開會，討論節能措施。

T: I've recently noticed how much paper I use on a daily basis and I've been trying to cut down. I've found that I very rarely actually need to print emails. Also, by utilizing my fax-modem, I don't ever need to print a hardcopy for faxing.

H: That's gonna add up! In the end you'll find it makes a huge positive difference!

D: But you know, even with all these good ideas and strategies, I feel like it counts for nothing when you factor in air travel. Our people make a lot of international trips each year and flying puts tons of CO2 into the atmosphere.

總裁Tim說，他最近一直注意節省紙張。節能專家Henry表示，That's gonna add up! 日積月累，一定會有成效。

Dana提出，盡管這些想法很好，但是如果考慮到出差坐飛行釋放的二氧化碳，那么這些措施都無異于杯水車薪。

H: Ah! Good point! Well, for starters, with teleconferencing and instant email one would hope business travel could be reduced. Did you know an economy class flight from Baltimore to Taipei makes you responsible for just over four tons of CO2? If you fly business class the number jumps to 12 tons.

Henry說，從巴爾的摩到臺北一張economy class經濟艙機票相當于釋放四噸二氧化碳，business class商務艙更可怕，相當于排放12噸二氧化碳。

T: But sometimes there's just no alternative. We have to check out factories, locations and in some countries, you really have to look the person in the eye and physically shake their hand.

H: This is true. So I'd like you all to consider buying carbon credits.

總裁Tim提出，有些時候，除了出差，沒有其他辦法。 Henry因此建議大家考慮購買carbon credits碳信用額。

F: Ah, I've heard about that. You can actually calculate how much carbon your trip is likely to put into the environment and you can offset that by paying to plant some trees.

H: That's right! There are web sites such as CarbonPlanet.com. They can help you work out our carbon debt, and then direct you to where you can buy carbon credits that go toward planting new trees.

D: That would make me feel a lot less guilty.

H: Well, it's great that you are all so willing to do your part to make a difference. Let's get back together in two weeks for another brainstorming session.

碳信用額就是把飛行里程折合成對環境的傷害，然后出錢種樹，作為補償。 大家決定兩周后，have another brainstorming session再開會，繼續集思廣益。