This study investigates the added burden Mexican and Taiwanese non-native English speaker (NNES) researchers perceive when writing research articles in English as a second language (L2) compared with their experience of first language (L1) science writing. 148 Mexican and 236 Taiwanese researchers completed an established survey of science writing burden. Results revealed significant differences between L1 and L2 science writing with an increased burden for L2 science writing consisting of an average increase of 24% in difficulty, 10% in dissatisfaction and 22% in anxiety. No significant differences between the Mexican and Taiwanese researchers were found. Regression analyses established that the variables of science writing burden contribute to a sense that English is a barrier to writing science. We maintain that the additional burden of L2 science writing constitutes a linguistic injustice and a barrier to science that should be addressed by relevant constituents.