Humans have increased atmospheric CO 2 concentration by more than a third since the Industrial Revolution began. This is the most important long-lived forcing of climate change. Methane.
Buy Forever stamps online directly from USPS. The current Forever stamp value is 49-cents - the current First-Class Mail one-ounce rate.
In Postage and Shipping. A 4 x 8 greeting card should only cost what the current price of a  stamp is. The current price of a stamp as of January 24, 2014, is  49 cents. Up to one ounce can be sent â¦for that price.