Almost half of the world’s human population lives in coastal areas, and associated coastal development has significantly degraded or destroyed many coastal ecosystems. Burgeoning human populations and rising sea levels only further constrain the availability of habitat that coastal species depend on.

California’s 1,100 mile coast has more than 200 threatened, endangered or rare species living in coastal habitats. There are hundreds of coastal estuaries that provide critical rearing habitat for marine species, and are also important for recreation, water filtration, and carbon sequestration.

Only 10 percent of California’s historic coastal wetlands remain. Without intervention, we are at risk of losing 40 percent of our remaining coastal wetlands to sea level rise over the coming decades. Conservancy scientists are working to reverse these trends. 

Freshwater Systems

California is one of the most hydrologically altered landscapes in the world. As water becomes…>>

Groundwater

In a normal year, groundwater accounts for 40 percent of California’s water supply. That…>>

Surface Flows

Californians have fundamentally altered many of the state’s rivers and streams with dams,…>>

Terrestrial Systems

In California, a day’s drive can take a visitor from record-setting desert heat to glaciated…>>

Wildlands

Nearly half of California is protected in some land status that prevents most kinds of intensive…>>

Harvested Landscapes

A third of California is privately-owned forestland, woodland or grassland. From redwood forests on…>>

Cultivated Landscapes

California is the leading agricultural state in the country and it’s agriculture generates…>>

Urban Areas and Infrastructure

With California’s population on track to reach 50 million people, the demand for energy,…>>

Fisheries

Wild capture fisheries supply food and jobs for hundreds of millions of people across the globe. Yet…>>

Coastal Conservation

Almost half of the world’s human population lives in coastal areas, and associated coastal…>>

Science in Action

Terrestrial | Planning | Technology | Economics

Wildfire and Communities

How can land protection and restoration help protect communities from wildfire?

Terrestrial | Marine | Economics | Science

TNC and FEMA

How do we increase climate resilience in ways that work for people and nature?

2024 | Terrestrial | Planning | Science | Publications & Reports

An approach to designing efficient implementation of 30×30 terrestrial conservation commitments

Carrie A. Schloss, D. Richard Cameron, Bradley Franklin, Christoph Nolte, Scott A. Morrison

In response to biodiversity declines worldwide, over 190 nations committed to protect 30% of their lands and waters by 2030 . As these jurisdictions move from planning to implementation, we propose a…

2024 | Terrestrial | Planning | Science | Publications & Reports

Climatically robust multiscale species distribution models to support pronghorn recovery in California

William T. Bean, H. Scott Butterfield, Jeanette K. Howard, Thomas J. Batter

In this paper, the authors used a variety of habitat suitability modeling approaches to begin to understand where pronghorn may exist in the future in California under different climate change…

2024 | Terrestrial | Marine | Science | Publications & Reports

Spatial Patterns of Vegetation Change in a Fire-Suppressed Coastal California Landscape

Lucy Genua, Brad Anderson, Meghan Bowen, Genelle Ives, Owen Liu, Thomas Paschos, H. Scott Butterfield, Kelly Easterday, Mark Reynolds, James H. Thorne

In this paper, the authors used historical vegetation data, from both aerial photographs and field transects, to assess the change in major vegetation types at the Dangermond Preserve over the last…

2024 | Marine | Economics | Science | Publications & Reports

Advancing fisheries sustainability and access through community fisheries trusts

Kate Kauer, Lyall Bellquist, Jenn Humberstone, Vienna Saccomanno, Dwayne Oberhoff, Sherry Flumerfelt, Mary Gleason

This 2024 paper by TNC staff and partners represents the first U.S.-wide synthesis of fisheries trusts – which are community-based entities that acquire and manage fishery privileges with the…

2024 | Freshwater | Terrestrial | Science | Publications & Reports

Potential Impacts to Biodiversity from Proposed Lithium Extraction in Nevada and California

Michael J. Clifford, Sophie S. Parker, Laurel Saito, Brian S. Cohen, Naomi S. Fraga

Lithium batteries are important for the clean energy transition in the United States because they are used in electric vehicles and for grid power storage. However, lithium extraction may have impacts…

2024 | Freshwater | Terrestrial | Marine | Science | Publications & Reports

Conservation Science Catalyst Fund - 2023 Annual Report

Scott Morrison, Brynn Pewtherer

The Nature Conservancy deploys science to help overcome major challenges facing people and nature. In today’s fast-paced world, turning threats to nature into opportunities for conservation…

2024 | Terrestrial | Planning | Science | Publications & Reports

Quantitative methods for integrating climate adaptation strategies into spatial decision support models

Nicholas A. Povak, Patricia N. Manley, Kristen N. Wilson

This study presents a methodology to integrate spatial assessments of current and future forest conditions to understand the potential to achieve desired conditions under climate change with ongoing…

2024 | Freshwater | Terrestrial | Publications & Reports

Potential impacts of proposed lithium extraction on biodiversity and conservation in the contiguous United States

Sophie S. Parker, Michael J. Clifford, Brian S. Cohen

To address climate change, the United States is incentivizing the production of electric vehicles containing domestically derived lithium batteries. Extracting this lithium may have environmental…

2024 | Terrestrial | Science | Publications & Reports

Oren Pollak Memorial Research Fund - 2024 RFP

Brynn Pewtherer

The Oren Pollak Memorial Research Fund was established in 2000 in memory of Dr. Oren Pollak, a leading grassland ecologist and restoration pioneer, as well as an ardent champion and mentor for…

2024 | Freshwater | Terrestrial | Publications & Reports

Expert bioblitz on the Atwood Preserve

Michael Clifford, Sophie Parker, Matt Rader, Lydia Bailey, Naomi Fraga, Chris Hass, Estella Hernandez, Jan Kempf, Lois Merkler, Michael Swink

The Amargosa River supports one of the most outstanding suites of endemic and imperiled species in the world. In 2019, TNC acquired the Atwood Preserve in the river’s headwaters, the…

2023 | | Planning | Science | Publications & Reports

Quantifying the smoke-related public health trade-offs of forest management

Claire L. Schollaert, Jihoon Jung, Joseph Wilkins, Ernesto Alvarado, Jill Baumgartner, Julien Brun, Tania Busch Isaksen, Jamie M. Lydersen, Miriam E. Marlier, Julian D. Marshall, Yuta J. Masuda, Charles Maxwell, Christopher W. Tessum, Kristen N. Wilson, Nicholas H. Wolff, June T. Spector

By modeling six scenarios of forest management, wildfire, and health impacts from smoke from 1981-2020, we found that moderate amounts of prescribed fire can decrease harmful particulate matter…

2023 | Terrestrial | Planning | Science | Publications & Reports

Contrasting management paradigms for pronghorn in the arid Southwest and their northern range: a review

William T. Bean, H. Scott Butterfield, Craig Fiehler, David Hacker, Jeanette K. Howard, Russell Namitz, Brandon Swanson, Thomas J. Batter

TNC launched a Water for Wildlife project motivated by understanding the importance of standing free water across the season for wildlife in general, but most importantly for those species sensitive…

2023 | Terrestrial | Science | Publications & Reports

Mojave Desert land-use change: revisiting conservation values after a decade of growth and development

Michael J. Clifford, Sophie S. Parker, Brian S. Cohen, Elaine York, Joel Tuhy

This paper provides an assessment of changes in the conservation value of lands in the Mojave Desert of Nevada and Utah resulting from renewable energy and other development between 2010 and 2018. The…

2023 | Terrestrial | Economics | Publications & Reports

Wildfire Resilience Insurance: Quantifying the Risk Reduction of Ecological Forestry with Insurance

The Nature Conservancy with Willis Towers Watson, Sarah Heard

California has the highest wildfire risk in the US, and climate change will continue to exacerbate the risk, at least in the foreseeable future. As a result, California is facing an insurance crisis,…

2023 | Terrestrial | Planning | Science | Publications & Reports

Interstate 15 Wildlife Crossing Design Considerations for Focal Wildlife Species. Santa Ana-Palomar Mountains Linkage Southern California

Trish Smith, Cheryl Brehme, Jill Carpenter, Nancy Frost, Megan Jennings, Barbara Kus, Scott Quinnell, Spring Strahm, T. Winston Vickers

The Nature Conservancy and the California Department of Transportation are planning 3 wildlife crossing infrastructure projects along a 3-mile stretch of Interstate 15 (I-15) in the Santa Ana-Palomar…

2023 | Freshwater | Terrestrial | Science | Publications & Reports

Statistical evaluation of the similarity of characteristics in springs of the California Desert, United States

Adam H. Love, Andy Zdon, Naomi S. Fraga, Brian Cohen, Maura Palacios Mejia, Rachel Maxwell, Sophie Parker

This paper presents results from the Mojave Desert Springs research project. The authors present a comprehensive statistical analysis of similarities between California desert springs. An observed…

2023 | Terrestrial | Science | Publications & Reports

Supporting the “virtuous cycle” in urban ecosystems: how research can inform plans, policies, and projects that impact urban resilience

Michele Romolini, Sophie S. Parker, Gregory B. Pauly, Eric M. Wood

This editorial introduces a group of 11 articles published as part of an organized research topic in the Urban Greening section of the journal Frontiers in Sustainable Cities. In contrast with the…

2023 | Marine | Economics | Science | Publications & Reports

Static management presents a simple solution to a dynamic fishery and conservation challenge

Christopher M. Free, Lyall F. Bellquist, Karin A. Forney, Jenn Humberstone, Kate Kauer, Qui Lee, Owen R. Liu, Jameal F. Samhouri, Jono R. Wilson, Darcy Bradley

Dynamic ocean management frameworks can be a useful approach to fisheries management under climate change. In the oceans, marine heatwaves are increasingly common symptoms of climate change that can…

2023 | Freshwater | Science | Publications & Reports

A decision‐support framework for dam removal planning and its application in northern California

Suman Jumani, Lucy Andrews, Theodore E. Grantham, S. Kyle McKay, Jeffrey Duda, Jeanette Howard

California has a dam problem. Since the start of the 20th century, the state has built thousands of dams on its rivers and streams. Now, more than 75% of the largest dams are greater than 50 years…