COVID-19 may have forced the 50th anniversary of Earth Day to be commemorated online last year, yet millions of people participated in calls to action. As we begin to look beyond the pandemic, however, it's vital to remember that we cannot go back to business-as-usual as far as our planet is concerned.
and to some extent, evenness (variances of species’ local abundance). They are therefore indifferent to species substitutions which may, however, reflect ecosystem stresses (such as those due to high fishing intensity).