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Total household incomewere engaged in this activity. Due to the difficulties of establishing the correctamount of NTFP‟s taken and the prices (since most were not sold) makes NTFP likelyto be much more important as an income than our data demonstrate.Nevertheless, by looking at the different types of environmental income up closely wesuspect that there is a strong relationship between household income andenvironmental income as a whole. Figure 18 shows this relationship, and illustrate asignificant relationship between the two we see that this is true (R 2 = 0.67; p = 0.01).16000140001200010000800060004000200000 2000 4000 6000 8000 10000 12000Total environmental incomeFigure 18: Relationship between total income and environmental income, KilosaDistrict, Tanzania, 2010As seen, forest products as an income source have various implications for thehouseholds depending on the particular resource. For instance whereas firewood is byall very important as a source of covering their daily energy needs for cooking, polesare used mostly in concern with construction and thus needed only rarely when a newhouse is built or an old one mended. Timber and charcoal is either used as a safety netor, increasingly so, as a stable income source. However the level of involvement andthe amount of income gained from the various sources varies greatly between bothwealth groups and between location, and whereas charcoal and poles/timber aremostly used by those with the highest income and they are also those receiving the201