Here's example on how to create a WMS layer instance using the Open Source JavaScript library OpenLayers. The possible values for layers can be found in the expandable list below.

  var wms = new OpenLayers.Layer.WMS(
    "Population Density",
    "http://sedac.ciesin.columbia.edu/geoserver/gwc/service/wms",
    {layers: 'gpw-v3:gpw-v3-population-density_2000'}
  );

show and hide Gridded Species Distribution (1) View WMS Layers

  • (1) Global Amphibians Family Richness Grids

    • species-v1-global-amphibian-family-richness

show and hide Global Fertilizer and Manure (4) View WMS Layers

  • (1) Phosphorus Fertilizer Application

    • ferman-v1-phosphorus-fertilizer-application
  • (1) Phosphorus in Manure Production

    • ferman-v1-phosphorus-in-manure-production
  • (1) Nitrogen Fertilizer Application

    • ferman-v1-nitrogen-fertilizer-application
  • (1) Nitrogen in Manure Production

    • ferman-v1-nitrogen-in-manure-production

show and hide Last of the Wild (3) View WMS Layers

  • (1) Global Human Influence Index (Geographic)

    • wildareas-v2-human-influence-index-geographic
  • (1) Last of the Wild (Geographic)

    • wildareas-v2-last-of-the-wild-geographic
  • (1) Global Human Footprint (Geographic)

    • wildareas-v2-human-footprint-geographic

show and hide Environmental Sustainability Index (22) View WMS Layers

  • (22) Environmental Sustainability Index

    • esi-environmental-sustainability-index-2005
    • esi-environmental-sustainability-index-2005_air-quality
    • esi-environmental-sustainability-index-2005_biodiversity
    • esi-environmental-sustainability-index-2005_eco-efficiency
    • esi-environmental-sustainability-index-2005_environ-governance
    • esi-environmental-sustainability-index-2005_environ-health
    • esi-environmental-sustainability-index-2005_greenhouse-gas-emissions
    • esi-environmental-sustainability-index-2005_human-sustenance
    • esi-environmental-sustainability-index-2005_land
    • esi-environmental-sustainability-index-2005_nat-disaster-vulnerability
    • esi-environmental-sustainability-index-2005_nat-resource-mgmt
    • esi-environmental-sustainability-index-2005_particip-international-collaborate
    • esi-environmental-sustainability-index-2005_private-sector-response
    • esi-environmental-sustainability-index-2005_reduce-air-pollution
    • esi-environmental-sustainability-index-2005_reduce-ecosystem-stress
    • esi-environmental-sustainability-index-2005_reduce-pop-press
    • esi-environmental-sustainability-index-2005_reduce-trans-environ-press
    • esi-environmental-sustainability-index-2005_reduce-waste-consump-press
    • esi-environmental-sustainability-index-2005_reduce-water-stress
    • esi-environmental-sustainability-index-2005_science-tech
    • esi-environmental-sustainability-index-2005_water-quality
    • esi-environmental-sustainability-index-2005_water-quantity

show and hide Global Rural-Urban Mapping Project (9) View WMS Layers

  • (1) Land and Geographic Unit Area Grids

    • grump-v1-land-geographic-unit-area
  • (3) Population Count Grid

    • grump-v1-population-count_1990
    • grump-v1-population-count_1995
    • grump-v1-population-count_2000
  • (3) Population Density Grid

    • grump-v1-population-density_1990
    • grump-v1-population-density_1995
    • grump-v1-population-density_2000
  • (1) Urban Extents Grid

    • grump-v1-urban-extents
  • (1) Settlement Points

    • grump-v1-settlement-points

show and hide Natural Disaster Hotspots (25) View WMS Layers

  • (1) Global Cyclone Hazard Frequency and Distribution

    • ndh-cyclone-hazard-frequency-distribution
  • (1) Global Earthquake Proportional Economic Loss Risk Deciles

    • ndh-earthquake-proportional-economic-loss-risk-deciles
  • (1) Global Drought Mortality Risks and Distribution

    • ndh-drought-mortality-risks-distribution
  • (1) Global Drought Hazard Frequency and Distribution

    • ndh-drought-hazard-frequency-distribution
  • (1) Global Earthquake Total Economic Loss Risk Deciles

    • ndh-earthquake-total-economic-loss-risk-deciles
  • (1) Global Flood Mortality Risks and Distribution

    • ndh-flood-mortality-risks-distribution
  • (1) Global Cyclone Total Economic Loss Risk Deciles

    • ndh-cyclone-total-economic-loss-risk-deciles
  • (1) Global Volcano Total Economic Loss Risk Deciles

    • ndh-volcano-total-economic-loss-risk-deciles
  • (1) Global Earthquake Mortality Risks and Distribution

    • ndh-earthquake-mortality-risks-distribution
  • (1) Global Flood Total Economic Loss Risk Deciles

    • ndh-flood-total-economic-loss-risk-deciles
  • (1) Global Volcano Mortality Risks and Distribution

    • ndh-volcano-mortality-risks-distribution
  • (1) Global Cyclone Mortality Risks and Distribution

    • ndh-cyclone-mortality-risks-distribution
  • (1) Global Cyclone Proportional Economic Loss Risk Deciles

    • ndh-cyclone-proportional-economic-loss-risk-deciles
  • (1) Global Earthquake Hazard Distribution - Peak Ground Acceleration

    • ndh-earthquake-distribution-peak-ground-acceleration
  • (1) Global Landslide Total Economic Loss Risk Deciles

    • ndh-landslide-total-economic-loss-risk-deciles
  • (1) Global Landslide Mortality Risks and Distribution

    • ndh-landslide-mortality-risks-distribution
  • (1) Global Drought Proportional Economic Loss Risk Deciles

    • ndh-drought-proportional-economic-loss-risk-deciles
  • (1)

    • ndh-landslide-hazard-frequency-distribution
  • (1) Global Volcano Proportional Economic Loss Risk Deciles

    • ndh-volcano-proportional-economic-loss-risk-deciles
  • (1) Global Earthquake Hazard Frequency and Distribution

    • ndh-earthquake-frequency-distribution
  • (1) Global Flood Proportional Economic Loss Risk Deciles

    • ndh-flood-proportional-economic-loss-risk-deciles
  • (1) Global Landslide Proportional Economic Loss Risk Deciles

    • ndh-landslide-proportional-economic-loss-risk-deciles
  • (1) Global Volcano Hazard Frequency and Distribution

    • ndh-volcano-hazard-frequency-distribution
  • (1) Global Drought Total Economic Loss Risk Deciles

    • ndh-drought-total-economic-loss-risk-deciles
  • (1) Global Flood Hazard Frequency and Distribution

    • ndh-flood-hazard-frequency-distribution

show and hide Environmental Performance Index (11) View WMS Layers

  • (11) Environmental Performance Index

    • epi-environmental-performance-index-2010
    • epi-environmental-performance-index-2010_agriculture
    • epi-environmental-performance-index-2010_air-pollution-effects-on-ecosystems
    • epi-environmental-performance-index-2010_air-pollution-effects-on-human-health
    • epi-environmental-performance-index-2010_biodiversity-and-habitat
    • epi-environmental-performance-index-2010_climate-change
    • epi-environmental-performance-index-2010_environmental-burden-of-disease
    • epi-environmental-performance-index-2010_fisheries
    • epi-environmental-performance-index-2010_forestry
    • epi-environmental-performance-index-2010_water-effects-on-ecosystems
    • epi-environmental-performance-index-2010_water-effects-on-human-health

show and hide Gridded Population of the World (15) View WMS Layers

  • (3) Population Count Grid Future Estimates

    • gpw-v3-population-count-future-estimates_2005
    • gpw-v3-population-count-future-estimates_2010
    • gpw-v3-population-count-future-estimates_2015
  • (3) Population Count Grid

    • gpw-v3-population-count_1990
    • gpw-v3-population-count_1995
    • gpw-v3-population-count_2000
  • (1) Land and Geographic Unit Area Grids

    • gpw-v3-land-geographic-unit-area
  • (3) Population Density Grid

    • gpw-v3-population-density_1990
    • gpw-v3-population-density_1995
    • gpw-v3-population-density_2000
  • (1) Coastlines

    • gpw-v3-coastlines
  • (1) Centroids

    • gpw-v3-centroids
  • (3) Population Density Grid Future Estimates

    • gpw-v3-population-density-future-estimates_2005
    • gpw-v3-population-density-future-estimates_2010
    • gpw-v3-population-density-future-estimates_2015

show and hide Anthropogenic Biomes (1) View WMS Layers

  • (1) Anthropogenic Biomes of the World

    • anthromes-anthropogenic-biomes-world-v1

show and hide Poverty Mapping (2) View WMS Layers

  • (1) Global Subnational Prevalence of Child Malnutrition

    • povmap-global-subnational-prevalence-child-malnutrition
  • (1) Global Subnational Infant Mortality Rates

    • povmap-global-subnational-infant-mortality-rates_2000

show and hide Climate Effects on Food Supply (1) View WMS Layers

  • (1) Effects of Climate Change on Global Food Production from SRES Emissions and Socioeconomic Scenarios

    • crop-climate-effects-climate-global-food-production

show and hide IPCC Assessment (2) View WMS Layers

  • (1) Fourth Assessment Report (AR4) Observed Climate Change Impacts

    • ipcc-assess-ar4-observed-climate-impacts
  • (1)

    • ipcc-assess-synthetic-assessment-vulnerability-climate-2005-2050-2100