Biology 2485B Lecture 2: Week 1 - Valuing Environmental Processes and Risks & Human Population Growth
10 Mar 2017
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Valui(cid:374)g e(cid:374)(cid:448)iro(cid:374)(cid:373)e(cid:374)tal processes a(cid:374)d risks & hu(cid:373)a(cid:374) populatio(cid:374) gro(cid:449)th. Population biology: what factors determine population growth rate, population = birth rate + immigration deaths emigration. In practice, growing populations follow logistic growth pattern. Largest growth rates are in third world countries: birth rate include birth and immigration, ca(cid:374)ada a(cid:374)d a(cid:373)eri(cid:272)a"s gro(cid:449)th rate is largel(cid:455) e(cid:454)plai(cid:374)ed (cid:271)(cid:455) i(cid:373)(cid:373)igratio(cid:374, eastern europe and japan have decreasing growth rates. Growth is associated with wealth: human development index in green. Laws, family planning: economic incentives make it easier to care for young, subsidized child care would increase fertility of population, baby bonuses, parental leave time etc. Left: ca(cid:374)ada"s populatio(cid:374) is i(cid:374)(cid:272)reasi(cid:374)g at a very small rate (almost completely stable: right: afghanistan is increasing. Human population projection: some evidence of a carrying capacity early & possible high up as well in the graph humans have been able to overshoot by so much and for so long.
