| A | B |
| to throw away | botar |
| to warm | calentar (ie) |
| to freeze | congelar |
| to damage | dañar |
| to throw away | desechar |
| to disintegrate | desintegrarse |
| to waste | desperdiciar |
| to extinguish | extinguir |
| to harm | perjudicar |
| to prevent | prevenir (ie) |
| to burn | quemar |
| to rescue | rescatar |
| steel | el acero |
| stream | el arroyo |
| trash | la basura |
| forest | el bosque |
| ozone layer | la capa del ozono |
| coal | el carbón |
| cardboard | el cartón |
| ash | la ceniza |
| fuel | el combustible |
| glass | el cristal |
| rubbish; debris | el desecho |
| waste | el desperdicio |
| greenhouse effect | el efecto invernadero |
| species | la especie |
| factory | la fábrica |
| iron | el hierro |
| smoke | el humo |
| heart attack | el infarto cardíaco |
| wood | la madera |
| raw material | la materia prima |
| environment | el medio ambiente |
| level | el nivel |
| lead | el plomo |
| rescue | el rescate |
| jungle | la selva |
| drought | la sequía |
| substance | la sustancia |
| environmental | ambiental |
| damaging | dañino/a |
| disastrous | nefasto/a |
| harmful | perjudical |
| safe to drink | potable |
| around | alrededor |
| through | a través de |
| on, over | sobre |
| to effect | afectar |
| to conserve,preserve,maintain | conservar |
| to give a disease to someone | contagiar |
| to damage, to harm | dañar |
| to cut down trees | deforester |
| to disappear | desaparecer (zc) |
| to destroy | destruir (y) |
| to extinguish | extinguir |
| to infect | infectar |
| to anger, exasperate | irritar |
| to protect | proteger |
| to purify | purificar |
| to recycle | reciclar |
| to save | salvar |
| effect | el efecto |
| conservation, preservation | la conservación |
| contagion, infection | el contagio |
| pollution, contamination | la contaminación |
| harm | el daño |
| deforestation | la deforestación |
| disappearance | la desaparición |
| destruction | la destrucción |
| extinction | la extinción |
| infection | la infectión |
| irritation | la irritación |
| protection | la protectión |
| purification | la purificatión |
| recycling | el reciclaje |
| salvation | la salvación |
| affected, unnatural | afectado/a |
| conserved, canned | conservado/a |
| contagious, infectious | contagioso/a |
| polluted, contaminated | contaminado/a |
| harmful, destructive | dañino/a |
| injured, hurt, spoiled | dañado/a |
| deforested | deforestado/a |
| removed, vanished | desaparecido/a |
| destroyed | destruido/a |
| extinct | extinto/a |
| infected | infectado/a |
| sed up, irritated | iritado/a |
| protected | protegido/a |
| pure, unadulterated, simple | puro/a |
| purified | purificado/a |
| recycled | recliclado/a |
| saved | salvado/a |
| water | el agua |
| aluminum | el aluminio |
| asthma | el asma |
| atmosphere | la atmósfera |
| bacteria | la bacteria |
| bronchitis | la bronquitis |
| lung cancer | el cáncer pulmonar |
| cement | el cemento |
| contamination | la contaminación |
| destruction | la destrucción |
| carbon dioxide | el dióxido de carbono |
| ecosystem | el ecosistema |
| electical energy | la energía eléctrica |
| nuclear energy | la energía nuclear |
| solar energy | la energía solar |
| emphysema | el enfisema |
| endangered species | las especiis en peligro de extinción |
| hydrogen | el hidrógeno |
| lake | el lago |
| acid rain | la lluvia ácida |
| carbon monoxide | el monóxido de carbono |
| nitrogen | el nitrógeno |
| ocean | el océano |
| oxygen | el oxígeno |
| petroleum | el petróleo |
| plastic | el plástico |
| river | el río |
| uranium | el uranio |
| to ensure | asegurar |
| to increase | aumentar |
| to set on fire | incendiar |
| to predict | predecir (i) |
| to foresee | prever |
| wire | el alambre |
| device | el aparato |
| quality | la calidad |
| amount | la cantidad |
| manufacturer, builder | el/la fabricante |
| computer science | la informática |
| workday | la jornada laboral |
| measure | la medida |
| broadcasting | los medios de difusión |
| leisure time | el ocio |
| radio wave | la onda |
| screen | la pantalla |
| piece | la pieza |
| internet | la red informática |
| key | la tecia |
| keyboard | el teclado |
| late, backward, slow (as in clock) | atrasado/a |
| beneficial | beneficioso/a |
| serious | grave |
| burned | quemado/a |
| healthy | saludable |
| to affect | afectar |
| to aggravate, make worse | agravar |
| to assure, to assure, to insure | asegurar |
| to increase | aumentar |
| to advance | avanzar |
| to constitute, to form | construir (y) |
| to disappear | desaparecer (zc) |
| to convert | convertir (ie,i) |
| to reduce | disminuir (y) |
| to make, to manufacture | fabricar |
| to maintain, to sustain | mantener (ie) |
| to foretell, to predict | predecir (i) |
| to foresee | prever |
| the effect | el efecto |
| gravity | la gravedad |
| safety | la seguridad |
| increase, rise | el aumento |
| advance,attack | el avance |
| construction | la construcción |
| conversion | la conversión |
| disappearance | la desaparición |
| diminution, decrease | la disminución |
| fabrication | la fabricación |
| maintenance | el mantenimiento |
| prediction | la predicción |
| foresight, forecast | la previsión |
| affected, unnatural | afectado/a |
| heavy, serious | grave |
| safe, secure, sure | seguro/a |
| augmented, increased | aumentado |
| constructed, built | construido/a |
| converted | convertido/a |
| vanished, disappeared | desaparecido/a |
| diminished, decreased | disminuido/a |
| fabricated | fabricado/a |
| maintained | mantenido/a |
| predicted | predicho/a |
| foreseen | previsto/a |
| automated | automático/a |
| cable, rope | el cable |
| circuit | el circuito |
| computer | la computadora |
| computer (España) | el ordenador |
| connection | la conexión |
| E-mail | el correo electrónico |
| compact disc | el disco compacto |
| hard disk | el disco duro |
| discette | el disquete |
| contractor, manager | el/la empresario/a |
| filter, love potion | el filtro |
| printer | el impresora |
| mass communication | los medios de comunicación en masa |
| motor | el motor |
| plant | la planta |
| mass production | la producción en masa |
| radar | el radar |
| radiation | la radiación |
| satellite | el satélite |
| key fields and professions | campos y profesiones claves |
| astrophysics | la astrofísica |
| biochemistry | la bioquímica |
| cybernetics | la cibernética |
| electronics | la electrónica |
| genetics | la genética |
| nuclear engineering | la ingeniería nuclear |
| chemistry | la química |
| technician | el/la técnico/a |
| astrophysicist | el/la astrofísico |
| biochemist | el/la bioquíimico/a |
| geneticist | el/la geneticista |
| nuclear engineer | el/la ingeniero/a nuclear |
| chemist | el/la químico/a |
| quality (as in a measure of worth) | calidad |
| Everything depends on the quality of the materials. | Todo depende de la calidad de los materiales. |
| quality (as in a characteristic of a person or thing) | cualidad |
| Her dedication is the quality I most admire. | Su dedicación es la cualidad que más le admiro. |
| I insist that you destroy the evicence. | Insisto en que destruyas la evidencia. |
| We are glad that you are able to see the satellite. | Nos alegramos de que puedas ver el salelíte. |
| It's good that they're investigating the emissions from that factory. | Es bueno que investiguen las emisiones de esa fábrica. |
| The engineer denies that the species will disappear. | El ingeniero niega que la especie desaparezca. |
| The politicion wants us to destroy the evidence. | El político quiere que destruyamos le evidencia. |
| The politician wants to destroy the evidence. | El político quiere destruir la evidencia. |
| I doubt I'll be late today; I'm leaving early. | Dudo que llegue tarde hoy, pues salgo temprano. |
| I am sure that the plant purifies the water. | Estoy seguro que la planta purifica el aqua. |
| I believe that the river is contaminated. | Creo que el rio está contaminado.. |
| It's evident that the cleanup has helped. | Es evidente que la limpieza ha ayudado. |
| I don't think it'll be hot tomorrow. | No creo que haga calor mañana. |
| I don't think that it's hot, but I don't like air conditioning. | No niego que hace calor, pero no me gusta el aire condicionado. |
| As an ecologist, I don't deny that the oil companies may do all that is possible to protect marine life. | Como ecologista no niego que las compañías petroleras hagan todo lo posible para proteger la vida marítima. |