Biodiversity science–policy panel calls for broadening value-of-nature concepts in sustainable development

Photo courtesy of Christian Ziegler., CC BY 2.5, via Wikimedia Commons
Photo courtesy of Christian Ziegler, CC BY 2.5, via Wikimedia Commons

Invaluables’ may have the highest value, according to Meine van Noordwijk

By Robert Finlayson, Forests News (CC BY-NC-SA 4.0)

The Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) approved the Summary for Policy Makers of the Assessment Report on the Diverse Values and Valuation of Nature on 9 July 2022 in its ninth plenary meeting in Bonn, Germany.

“It is essential to understand the different ways in which people value nature, as well as the different ways in which these values can be measured,” said Ana Maria Hernández Salgar, IPBES chairperson. “The diversity of values of nature is often overlooked in policy decisions. Effective policy decisions about nature must be informed by the wide range of values and valuation methods, which makes the IPBES’ values assessment a vital scientific resource for policy and action for nature and human well-being.”

The Assessment Report comes at a critical time for life on Earth, which is fast losing its richness. The Report considers the trend to assign various values — including financial ones — to nature in an attempt to recognize the worth of natural ecosystems to human wellbeing.

“‘Invaluables’ may have the highest value,” said Meine van Noordwijk, CIFOR-ICRAF’s distinguished science fellow and one of 20 experts from around the world who functioned as ‘convening lead author’ for the Assessment. “For some types of decisions and decision-makers, it is relevant to use financial units to represent at least part of the value of nature to people but there is always a risk that such statements are misinterpreted.”

The Assessment has been a four-year journey, with many rounds of feedback, peer review and policy consultations. Detailed discussions by government delegates of the Summary Report will have increased the relevance of the key messages for discussion at global and national levels.

The word ‘value’ has many meanings, ranging from numbers through prices to non-negotiable core principles, he said. To value a tree, a forest or an agroforestry landscape means interacting with many perspectives. The more people involved, the wider the set of values that matters and which has to be taken into account.

This is of grave importance owing to the rapid and massive loss of species that is not confined to a particular group of drivers in one or two locations but is worldwide, all-embracing and under-recognized.

Consumers, for example, currently don’t pay a ‘true price’ for products sourced from nature (which is, ultimately, all products). Decisions by consumers and producers that are based on a narrow set of market values for nature are the hidden driver of the global biodiversity crisis. Bringing these values into the open can help people better understand the costs of over-exploitation and increase the likelihood of ensuring that the values — including the less tangible, non-financial ones — are honoured and preserved.

Importantly, the way the ‘conservation of nature’ is currently framed frequently ignores the values of people who live in any given ‘conservation’ area, with usually negative impact on the intended objectives for the conservation area. These people need to be recognised and respectfully included in decision processes.

Van Noordwijk noted that from examination of countries’ biodiversity reports and action plans drawn up in response to the UN Convention on Biological Diversity, it’s clear that less than 25% of the world’s governments are on track to integrate values of nature that are beyond those recognized by markets. But he also noted that current valuation studies rarely report on the uptake of such in decisions related to governments’ policies and programmes.

The six chapters of the Assessment Report make the point of distinguishing between ‘instrumental’ values — which are those that can be measured by the goods and services that nature, biodiversity or well-functioning ecosystems provide to people — and ‘relational’ values: those that may be equally important to people’s well-being in immaterial ways.

The types of values that are most effectively communicated depend on the audience and the context, meaning that communication is as important as the decisions themselves that are made by governments and others in relation to the conservation of biological diversity.

“Scientists and other people interested in the issue have to help decision-makers understand so that they can frame policies and actions that will be effective,” he said. “Particularly, drawing decision-makers’ attention to the fact that humans who depend most on an area considered worthy of conservation need to be fully involved in decisions regarding it and that the intangible values — such as climate regulation, maintenance of healthy ecosystems and the water cycle — need to be fully recognised.”

Van Noordwijk stressed that from a ‘forests, trees and agroforestry’ perspective, the international acceptance of the Assessment Report can help pursuit of a dual strategy of 1) clarifying the way ecosystem structures and functions contribute instrumental values to people locally, nationally and globally and, thus, the economic values that are at stake if the current trend of biodiversity loss continues, and which can be partially recovered through ‘restoration’ of degraded landscapes; and 2) engaging with stakeholders to appreciate, and recognize, the various relational values that matter to them.

“The latter can, at the very least, help in more effective communication,” he said, “not only in a language that people can understand but also in a language that speaks to their hearts.”

Around the world, examples abound of conflicts that might be reduced or completely eradicated if these points are better understood.

Light pollution is disrupting the seasonal rhythms of plants and trees, lengthening pollen season in US cities

Photo by Saad Chaudhry on Unsplash
Photo by Saad Chaudhry on Unsplash

By Yuyu Zhou, The Conversation (CC BY-NC-ND 4.0).

The big idea

City lights that blaze all night are profoundly disrupting urban plants’ phenology – shifting when their buds open in the spring and when their leaves change colors and drop in the fall. New research I co-authored shows how nighttime lights are lengthening the growing season in cities, which can affect everything from allergies to local economies.

In our study, my colleagues and I analyzed trees and shrubs at about 3,000 sites in U.S. cities to see how they responded under different lighting conditions over a five-year period. Plants use the natural day-night cycle as a signal of seasonal change along with temperature.

We found that artificial light alone advanced the date that leaf buds broke in the spring by an average of about nine days compared to sites without nighttime lights. The timing of the fall color change in leaves was more complex, but the leaf change was still delayed on average by nearly six days across the lower 48 states. In general, we found that the more intense the light was, the greater the difference.

Chart: The Conversation/CC-BY-ND Source: Meng, et al. 2022 Get the data Download image

We also projected the future influence of nighttime lights for five U.S. cities – Minneapolis, Chicago, Washington, Atlanta and Houston – based on different scenarios for future global warming and up to a 1% annual increase in nighttime light intensity. We found that increasing nighttime light would likely continue to shift the start of the season earlier, though its influence on the fall color change timing was more complex.

Why it matters

This kind of shift in plants’ biological clocks has important implications for the economicclimate, health and ecological services that urban plants provide.

On the positive side, longer growing seasons could allow urban farms to be active over longer periods of time. Plants could also provide shade to cool neighborhoods earlier in spring and later in fall as global temperatures rise.

But changes to the growing season could also increase plants’ vulnerability to spring frost damage. And it can create a mismatch with the timing of other organisms, such as pollinators, that some urban plants rely on.

Urban light intensity varies among cities, and among neighborhoods within cities. Yuyu Zhou, CC BY-ND
Urban light intensity varies among cities, and among neighborhoods within cities. Yuyu Zhou, CC BY-ND

A longer active season for urban plants also suggests an earlier and longer pollen season, which can exacerbate asthma and other breathing problems. A study in Maryland found a 17% increase in hospitalizations for asthma in years when plants bloomed very early.

What still isn’t known

How the fall color timing will change going forward as night lighting increases and temperatures rise is less clear. Temperature and artificial light together influence the fall color in a complex way, and our projections suggested that the delay of coloring date due to climate warming might stop midcentury and possibly reverse because of artificial light. This will require more research.

How urban artificial light will change in the future also remains to be seen.

One study found that urban light at night had increased by about 1.8% per year worldwide from 2012-2016. However, many cities and states are trying to reduce light pollution, including requiring shields to control where the light goes and shifting to LED street lights, which use less energy and have less of an effect on plants than traditional streetlights with longer wavelengths.

Urban plants’ phenology may also be influenced by other factors, such as carbon dioxide and soil moisture. Additionally, the faster increase of temperature at night compared to the daytime could lead to different day-night temperature patterns, which might affect plant phenology in complex ways.

Understanding these interactions between plants and artificial light and temperature will help scientists predict changes in plant processes under a changing climate. Cities are already serving as natural laboratories.

The Conversation

Today Is International Forest Day

In 2012, The United Nations General Assembly proclaimed March 21 the International Day of Forests.

The Day raises awareness of the importance of forests. The organizers, United Nations Forum on Forests, the Food and Agriculture Organization of the United Nations (FAO), the Collaborative Partnership on Forests, and other organizations, encourage tree-planting and other celebratory events.

This year’s theme is Forests and Biodiversity.