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Human Population Growth - Crash Course Ecology #3

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Overview

Added

March 17, 2026

Subject & domain

life-health · population-ecology

Grade range

Grade 9 (Freshman)–Grade 12 (Senior)

Page kind

Video

Keywords

crash course ecology exponential growth human animal hank green biology population species quantity quality r vs k selection theory r selected k selected carry capacity growth rate reproduction boom bust limiting factors food agriculture medicine health death birth habitat technology space consumption ecological footprint resources extinction competition water culture women education choice birth control solution vlogbrothers

Introduction

If being alive on Earth were a contest, humans would win it hands down. We're like the Michael Phelps of being alive but with 250,000 times more gold medals. Today, Hank is here to tell us the specifics of why and how human population growth has happened over the past hundred and fifty years or so, and how those specifics relate to ecology.

Table of Contents

  1. R vs. K Selection Theory 01:41
  2. Causes of Exponential Human Growth 03:24
  3. Human Carrying Capacity 03:30
  4. Ecological Footprints 06:40
  5. Causes for Decline in Human Growth Rate 08:10

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