In this first worldwide synthesis of in situ and satellite-derived lake data, we find that lake summer surface water temperatures rose rapidly (global mean = 0.34°C decade

Products derived from medicinal plants have been used for therapeutic purposes for centuries. Herbal products are generally considered safe and have been proven effective against certain ailments. They are also extensively used, particularly in many Asian, African and other developing countries (Patwardhan et al., 2005). There is an urgent need to establish the identity, purity and quality of herbal products in order to have full efficacy and safety.