TASK DEFINITION: In this task, you are given a sentence in Spanish and your task is to translate it into English. In translation, keep the numbers and capitalization (capitalize only the first word of each sentence and name).
PROBLEM: Éste es un asunto acerca del cual mis opiniones personales han sido siempre sumamente inequívocas, pues siempre he votado contra la pena de muerte.

SOLUTION: This has always been a subject about which I personally have felt extremely strongly, I have always voted against the death penalty.

PROBLEM: Es un paso atrás.

SOLUTION: It is a retrograde step.

PROBLEM: Se propone la necesidad de alcanzar un objetivo final para las concentraciones en el medio marino, cercano a los valores de fondo para las sustancias que hubiera naturalmente y cercano a cero para las sustancias sintéticas creadas por el hombre.

SOLUTION:
It is proposed that a target should be achieved for concentrations in the aquatic environment which is close to the background values for naturally occurring substances and close to zero for humanly produced synthetic substances.