Pulps made from materials such as wheat straw or rice straw are environmentally preferable. Avoid coated papers where possible, unless the coating allows use of a paper with a lower basis weight than the uncoated alternative, for example by providing greater opacity. Paper 2 is acceptable because it is of a lower basis weight. It also requires less fiber. Think twice before using colored papers.
Pastel colors are generally acceptable for recycling.
However, any colored paper is produced using various dyes or pigments, the production of which creates environmental impacts. Avoid use of such papers whenever you can. Avoid using envelopes with covered windows wherever possible, in order to enhance their recyclability. Use adhesives on envelopes and mailing labels only if they are water-based and do not contain chlorinated organic compounds, many of which are persistent, toxic chemicals. Avoid the use of adhesive labels wherever possible.