Over the past four decades, numerous experiments have explored how terrestrial ecosystems respond to climate warming, changing precipitation regimes, elevated CO 2 (eCO 2) and nitrogen (N) enrichment ...

A correlational study is a research design that examines the relationships between two or more variables. It is non-experimental, meaning the experimenter does not manipulate or control any variables.

Human behavioural research conducted online is rapidly growing. Although powerful, this approach can suffer from reduced experimental control. Here we outline ten principles for designing and ...