Lesson1 本文

look at the picture above

it looks like a delicious hamburger

actually

the meat in the bun

is not real

it is made from soybeans

in recent years

many companies have been competing

to develop substitutes for meats

such as beef,pork,and chicken

as a result

the meat substitutes now taste quite real

there are various reasons

why people choose meat substitutes

some want them for health reasons

others want them for ideological reasons

another reason is to protect the environment

livestock farming generates large amounts of greenhouse gases

by choosing meat substitutes

people hope to reduce livestock numbers

and cut greenhouse gas emissions

meat substitutes are also good for food security

by 2050

the world’s population will reach 10 billion

meat substitutes will help to feed these people

at present

switching from real meat to meat substitutes

is not easy

some of them contain a lot of salt and additives

so they are not necessarily healthier

than real meat

moreover

manufacturing costs are high

so meat substitutes are expensive

these problems

however