… Walker is credited with being one of the men who built an … In this capacity, he repeatedly
accompanied his B-24 and B-17 units … General Walker was killed in action 5 January 1943 while …

Scenarios of changes in biodiversity for the year 2100 can now be developed based on
scenarios of changes in atmospheric carbon dioxide, climate, vegetation, and land use and the …

In this millennium, global drylands face a myriad of problems that present tough research,
management, and policy challenges. Recent advances in dryland development, however, …

All ecosystems are exposed to gradual changes in climate, nutrient loading, habitat
fragmentation or biotic exploitation. Nature is usually assumed to respond to gradual change in a …

Metal halide perovskites of the general formula ABX 3 —where A is a monovalent cation such
as caesium, methylammonium or formamidinium; B is divalent lead, tin or germanium; and …

Although Earth has undergone many periods of significant environmental change, the planet's
environment has been unusually stable for the past 10,000 years 1, 2, 3. This period of …

Anthropogenic pressures on the Earth System have reached a scale where abrupt global
environmental change can no longer be excluded. We propose a new approach to global …

Advances in modern sequencing technologies allow us to generate sufficient data to analyze
hundreds of bacterial genomes from a single machine in a single day. This potential for …

Functional impairment of T cells is characteristic of many chronic mouse and human viral
infections. The inhibitory receptor programmed death 1 (PD-1; also known as PDCD1), a …

Increasingly, cracks are appearing in the capacity of communities, ecosystems, and landscapes
to provide the goods and services that sustain our planet's well-being. The response …