The biosphere (from Greek βίος bíos "life" and σφαῖρα sphaira "sphere") also known as the ecosphere (from Greek οἶκος oîkos "environment" and σφαῖρα), is the worldwide sum of all ecosystems.
A biosfera (do grego βίος bíos "vida" e σφαῖρα sphaira "esfera"), tamén coñecida como ecosfera (do grego οἶκος oîkos "ambiente" e σφαῖρα) é o conxunto total de ecosistemas do planeta.