David Lam
@davidalam.bsky.social
Development economist and economic demographer, University of Michigan.
Sociology
22%
Political science
22%
David Lam
@davidalam.bsky.social
· Feb 26
IPUMS-DHS
IPUMS-DHS facilitates analysis of Demographic and Health Surveys, administered in low- and middle-income countries since the 1980s.
www.idhsdata.org
U Minnesota IPUMS has the DHS data. BUT web site says:
"Registration and access for IPUMS DHS is managed by The DHS Program, which is not reviewing new user applications or requests for expanded access from currently approved users at this time. IPUMS DHS data remain available to approved users."
"Registration and access for IPUMS DHS is managed by The DHS Program, which is not reviewing new user applications or requests for expanded access from currently approved users at this time. IPUMS DHS data remain available to approved users."
Reposted by Jason M. Fletcher, Wendy D. Manning, David Lam
The #PAA2025 preliminary program is online: submissions.mirasmart.com/PAA2025/Itin...
Make sure you are registered before rates increase in March: www.populationassociation.org/paa2025/reg-...
Make sure you are registered before rates increase in March: www.populationassociation.org/paa2025/reg-...
David Lam
@davidalam.bsky.social
· Jan 24
<em>Population and Development Review</em> | Population Council Journal | Wiley Online Library
The UN projects that world population will peak at 10.3 billion in 2084, a 2.1 billion increase from 2024. Can the world provide food, water, and other resources to 10.3 billion people? How will addi...
doi.org
15) For details and many caveats, see the full paper in Population and Development Review (open access): doi.org/10.1111/padr...
David Lam
@davidalam.bsky.social
· Jan 24
14) This is due to the combination of the steep income gradient in emissions and the fact that population growth will be heavily concentrated in the low-emissions lower-income countries, with higher income countries collectively experiencing population decline.
David Lam
@davidalam.bsky.social
· Jan 24
13) Surprisingly, although UN projections imply the addition of over 2 billion people by 2084, projections of CO2 in 2084 are almost identical whether we assume that 2019 populations are constant or assume that every country follows UN projections.
David Lam
@davidalam.bsky.social
· Jan 24
12) The emission-reducing impact of the 500 million population decline in high-emission higher income countries (UMICs and HICs, including China) offsets the emission-increasing impact of the 2.9 billion population increase in low-emission lower-income countries (LICs and LMICs).
David Lam
@davidalam.bsky.social
· Jan 24
11) Population growth makes almost no difference for projections of energy and CO2. Global CO2 is projected to fall 50% in the absence of population change due to declines in energy/income intensity and carbon/energy intensity. Adding UN population projections, CO2 falls by 52%.
David Lam
@davidalam.bsky.social
· Jan 24
10) Water consumption would increase only 1% due to income growth, but would increase 21% when UN population projections are added to the simulations.
David Lam
@davidalam.bsky.social
· Jan 24
9) I simulate future trends with and without the UN projected population changes. Total world food consumption is projected to increase 15% by 2084 due to income growth alone. This increases to 45% when each country follows the median UN population projections.
David Lam
@davidalam.bsky.social
· Jan 24
8) I project world food, water, energy, and CO2 to 2084. Projected income growth is combined with income/consumption gradients for food and water, and is combined with projected declines in energy/income intensity and carbon/energy intensity for energy and CO2.
David Lam
@davidalam.bsky.social
· Jan 24
7) Second, population growth to 2084 is concentrated in low-income (LICs) and lower-middle-income (LMIC) countries, which collectively will add 2.9 billion people 2019-84. Upper-middle-income (UMIC) and high-income (HIC) countries will lose 0.5 billion, including a 600 million drop in China.
David Lam
@davidalam.bsky.social
· Jan 24
6) First, per capita consumption levels differ significantly by income level, with steeper gradients for energy and CO2 than for food and water. Food p/c is 1.5 times higher in high-income countries (HICs) than low-income countries (LICs), but CO2 p/c is 35 times higher in HICs than LICs.
David Lam
@davidalam.bsky.social
· Jan 24
How will two billion more people affect food, water, energy, and CO2? - N-IUSSP
David Lam looks at the resource impact of the projected 2.1 billion increase in world population by 2084. He concludes that population change will increase demand for food and water, ... Read more
www.niussp.org
5) Looking forward, I simulate the impact of UN population projections on food, water, energy, and CO2. I project from 2019 to 2084, using 2019 as the base year to avoid the impact of COVID. Results are summarized in a recent post on N-IUSSP. Three graphs explain the key points:
David Lam
@davidalam.bsky.social
· Jan 24
4) There are clear economic explanations for why food and resources have met the population challenge better than water and emissions. Food and most non-renewable resources are responsive to price signals caused by increasing demand. This is much less true for water and emissions.
David Lam
@davidalam.bsky.social
· Jan 24
3) The record of recent decades is less encouraging for water and greenhouse gases. Many countries face serious water shortages, and CO2 emissions have dramatically increased. Climate change is obviously a major challenge in coming decades.
David Lam
@davidalam.bsky.social
· Jan 24
2) We have not had major shortages of non-renewable resources, in spite of adding over 5 billion people since 1960. Pre-COVID, real prices of most non-petroleum resources were around 1960s levels. After COVID spikes, prices are returning to 1960s levels.
David Lam
@davidalam.bsky.social
· Jan 24
1)The last 60 years are encouraging regarding food and non-renewable resources. Food production per capita has risen in every region, though barely so in Africa. Population growth rates are falling everywhere, so food production does not need to grow as fast as in recent decades.
David Lam
@davidalam.bsky.social
· Jan 24
<em>Population and Development Review</em> | Population Council Journal | Wiley Online Library
The UN projects that world population will peak at 10.3 billion in 2084, a 2.1 billion increase from 2024. Can the world provide food, water, and other resources to 10.3 billion people? How will addi...
doi.org
Can the world support another 2 billion people? That is the UN’s projected increase from now until the peak is reached in 2084. I look at this question in a new paper in Population and Development Review’s 50th anniversary issue. A few highlights: doi.org/10.1111/padr...
Reposted by David Lam
Monitoring the Future: Base Year & Follow-Up Core Panel Data, Ages 18-30, United States, 1976-2021 [Restricted-Use]
bit.ly
New data alert! Monitoring the Future Panel core data for young adults (ages 18-30) from 1976-2021 are now available through the @icpsr.bsky.social @nahdap.bsky.social data portal: bit.ly/MTFcore
Reposted by David Lam
James Allen IV
@jealleniv.bsky.social
· Dec 17
When school overlaps with farming: Measuring reduced educational advancement and simulating solutions in Africa
The social costs of calendars.
on.cgiar.org
🏫When the school year competes with farm work, it becomes a barrier to educating rural children. 🧑🌾 But changing the school calendar can help!
A summary of research thus far, including my new collaboration in #Madagascar, on the @ifpri.org blog: on.cgiar.org/3P5HNjn
@cgiar.org #FCMinitiative
A summary of research thus far, including my new collaboration in #Madagascar, on the @ifpri.org blog: on.cgiar.org/3P5HNjn
@cgiar.org #FCMinitiative
Reposted by David Lam
The Dorothy S. Thomas Award is presented annually for the best graduate student paper on the interrelationships among social, economic and demographic variables. Nominations for this and other @popassocamerica.bsky.social awards are due by Jan. 31 2025! #PAA2025 ow.ly/l10X50U2wgH
Reposted by David Lam, Cynthia Kinnan
Hope Michelson
@hopecm.bsky.social
· Dec 3
Midwest International Economic Development Conference
publish.illinois.edu
The 22nd Midwest International Economic Development Conference (MWIEDC) will be held at UIUC March 28–29, 2025. Co-hosted by Ag Econ and Econ. Mushfiq Mobarak @mushfiq-econ.bsky.social keynote. Always one of my favorite conferences.
Deadline for submissions Jan 8, 2025.
Deadline for submissions Jan 8, 2025.
Reposted by David Lam
Our World in Data
@ourworldindata.org
· Nov 25
The world population grew fast over the last 60 years, but farmers grew fruits and vegetables even faster
https://www.nber.org/conferences/gender-economy-spring-2025
t.co
Submit your papers for the spring 2025 NBER Gender in the Economy meeting!
The theme is "Women in the Digital World".
Submission Deadline: 12/9/24
Meeting: 2/28/25 in Cambridge
t.co/DGsccq6Blw
The theme is "Women in the Digital World".
Submission Deadline: 12/9/24
Meeting: 2/28/25 in Cambridge
t.co/DGsccq6Blw