n email address!'); return false; } var emailRegExp = new RegExp("[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?"); if (!emailRegExp.test(email) || email.indexOf('.') == -1) { alert('The email address that you entered is invalid!'); return false; } return true; }

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Costanza, R. (1980) Embodied Energy and Economic Values. Science, 210, 1219-1224.
https://doi.org/10.1126/science.210.4475.1219

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