Which reduces climate change faster?

One of the authors working on the measurement system. Credit: Jonathan D. Muller

Photovoltaic fields outperform afforestation as a global climate-change mitigation strategy, according to a study published in the journal PNAS Nexus.

Forests mitigate climate change by sequestering carbon. Photovoltaic (PV) energy mitigates climate change by replacing fossil fuels. Both also increase global heat load because they make the land surface darker, which absorbs heat.

Rafael Stern, Jonathan Muller, and colleagues investigated which land use—trees or solar panels—more quickly offsets the increased heat they produce due to surface darkening. The authors measured surface albedo at a solar field in a hyper-arid region in the Arava valley in Israel.

Afforestation data was measured at a research station at the Yatir forest at the northern edge of the Negev desert. The authors used this data to calculate the break-even time required to balance the positive radiative forcing due to reduced albedo and negative radiative forcing due to carbon emission suppression of PV power generation or carbon sequestration by forests.

Solar panels vs planting forests: which reduces climate change faster?
Aerial view of Yatir Forest with the adjacent Negev desert in the background. Credit: Jonathan D. Muller

In semiarid land, photovoltaic fields break even and begin offering climate change mitigation benefits after about 2.5 years, which is more than fifty times faster than afforestation. In humid lands, the gap is not so wide, but solar panels continue to have the advantage.

The authors note that forests provide many benefits beyond climate change mitigation, including ecosystem, climate regulation, and social services.

More information:
Rafael Stern et al, Photovoltaic fields largely outperform afforestation efficiency in global climate change mitigation strategies, PNAS Nexus (2023). DOI: 10.1093/pnasnexus/pgad352

Provided by
PNAS Nexus

Citation:
Solar panels vs planting forests: Which reduces climate change faster? (2023, November 22)
retrieved 25 November 2023
from https://techxplore.com/news/2023-11-solar-panels-forests-climate-faster.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

Share with your friends!

Leave a Reply

Your email address will not be published. Required fields are marked *

Get the latest technology news and updates

STRAIGHT TO YOUR INBOX

Thank you for subscribing.

Something went wrong.

x  Powerful Protection for WordPress, from Shield Security
This Site Is Protected By
Shield Security