Error message
Warning: Undefined array key "#items" in clf_preprocess_page() (line 106 of themes/custom/clf/clf.theme).
clf_preprocess_page()
call_user_func_array() (Line: 261)
Drupal\Core\Theme\ThemeManager->render() (Line: 491)
Drupal\Core\Render\Renderer->doRender() (Line: 248)
Drupal\Core\Render\Renderer->render() (Line: 484)
Drupal\Core\Template\TwigExtension->escapeFilter() (Line: 94)
__TwigTemplate_df87185dc318258d8f0fe99621d96781->doDisplay() (Line: 387)
Twig\Template->yield() (Line: 343)
Twig\Template->display() (Line: 358)
Twig\Template->render() (Line: 35)
Twig\TemplateWrapper->render() (Line: 33)
twig_render_template() (Line: 348)
Drupal\Core\Theme\ThemeManager->render() (Line: 491)
Drupal\Core\Render\Renderer->doRender() (Line: 248)
Drupal\Core\Render\Renderer->render() (Line: 158)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 638)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 159)
Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse() (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray()
call_user_func() (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 186)
Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53)
Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle() (Line: 201)
Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 138)
Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 87)
Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 50)
Drupal\ban\BanMiddleware->handle() (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36)
Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 741)
Drupal\Core\DrupalKernel->handle() (Line: 19)
Polly Walker Ecology Fund Lecture
The Polly Walker Ecology Fund was established at the Center in November 2008 to honor Polly Walker, CLF’s first Associate Director, and to increase our understanding and application of the essential ecological perspective first promoted by Sir Albert Howard in 1939: “The whole problem of health in soil, plant, animal, and man is one great subject.”
The Fund supports bringing distinguished ecologists to the Center for a Livable Future and Johns Hopkins University, enables students at the Johns Hopkins Bloomberg School of Public Health to conduct research projects and advocacy activities focusing on ecologic issues, and supports faculty in exploring new dimensions of the ecology of soils, water and air that advance the mission of the Center. The Polly Walker Ecology Fund is supported by an anonymous donor and longtime friend of the Center.
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Alessandro Demaio
October 23, 2019
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Cathrine Sneed
May 3, 2018
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June 13, 2017
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Tom Pelton, Carole Morison, Holly Freishtat, Joyce Smith, and Rev. Dr. Heber Brown III
April 28, 2016
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Robert K. Musil
April 11, 2014
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Is Sustainability Still Possible? (Flyer)
Erik Assadourian
September 24, 2013
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Francis Thicke
October 24, 2012
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